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DEPARTMENT OF THE ARMY TECHNICAL MANUAL 
DEPARTMENT OF THE AIR FORCE TECHNICAL ORDER 



TM 11-5820-358-20 
TO 31R1-2URR-442 



ORGANIZATIONAL MAINTENANCE 
MANUAL 

RADIO RECEIVER R-390A/URR 



This reprint includes all changes in effect at the 
time of publication; changes 2 through 4. 

DEPARTMENTS OF THE ARMY AND THE AIR FORCE 
10 FEBRUARY 1961 



WARNING 



DANGEROUS VOLTAGES EXIST 
IN THIS EQUIPMENT 



Be careful when working on the 240-volt power supply and the circuits connected to it, or on the 
1 55/280-volt ac line connections Before connecting the receiver to an ac source, be sure that the 
chassis is connected to the same ground " the ac source. 



DON'T TAKE CHANCES! 



Change in force: C2, C 3, and C 4 



TM 11-5820-35820 
T0 31R1-2URR-442 
C4 



CHANGE DEPARTMENTS OF THE ARMY 

AND THE AIR FORCE 

No. 4 WASHINGTON, DC, 29 February 1980 

Organizational Maintenance Manual 
RADIO RECEIVER R-390A/URR 
(NSN 5820-00-538-7555) 



TM 11-5820-358-20, 10 February 1961, is changed as follows: 
The title is chan ged to read as s hown above. 

Page 3. | Paragraph 1.1| is superseded as follows: 

1 .1 . Indexes of Publications 

a. DA Pam 310-4. Refer to the latest issue of DA 
Pam 310-4 to determine whether there are new editions, 
changes or additional publications pertaining to the 
equipment. 

b. DA Pam 310-7. Refer to DA Pam 310-7 to 
determine whether there are modification work orders 
(MWO's) pertaining to the equipment. 

I Paragraphia s superseded as follows: 

2. Maintenance Forms, Records and Reports 

a. Reports of Maintenance and Unsatisfactory 
Equipment. Department of the Army forms and 
procedures used for equipment maintenance will be 
those prescribed by TM 38-750, The Army Maintenance 
Management System (TAMMS) (Army). Air Force 
personnel will use AFM 66-1 for maintenance reporting 
and TO 00-35D54 for unsatisfactory equipment 
reporting. 

b. Report of Packaging and Handling Deficiencies. 
Fill out and forward DD Form 6 (Packaging 
Improvement Report) as prescribed in AR 700- 
58/NAVSUPINST 4030.29/AFR 7113/MCO P4030.29A, 
and DLAR 4145.8. 

c. Discrepancy in Shipment Report (D IS REP) 
(GSF 361). Fill out and forward Discrepancy in 
Shipment Report (DISREP) (SF 361) as prescribed in 
AR 55-38/NAVSUPINST 4610.33B/ AFR 75-18/MCO 
P461 0. 1 9C and DLAR 4500.15 . 

I Paragraphs 2.11 [Z2~1[2in and lZ4Jare added 
after l paragraph 21 



2.1 . Destruction of Army Materiel 

Demolition and destruction of electronic equipment will 
be under the direction of the commander and in 
accordance with TM 750-244-2. 

2.2. Administrative Storage 

For procedures, forms, and records, and inspections 
required during administrative storage of this equipment, 
refer to TM 740-90-1 . 

2.3. Reporting Errors and Recommending 

Improvements 

a. You can help improve this manual. If you find 
any mistakes or if you know of a way to improve the 
procedures, please let us know. Mail your letter or DA 
Form 2028 (Recommended Changes to Publications 
and Blank Forms) direct to: Commander, US Army 
Communications and Electronics Materiel Readiness 
Command, ATTN: DRSEL-ME-MQ, Fort Monmouth, NJ 
07703. 

b. For Air Force, submit AFTO Form 22 (Technical 
Order System Publication Improvement Report and 
Reply) in accordance with paragraph 6-5, Section VI, 
TO 00-5-1 . Forward direct to prime ALC/MST. 

c. In either case, a reply will be furnished direct to 

you. 

2.4. Reporting Equipment Improvement 

Recommendations (EIR) 

a. Army. If your Radio Receiver R-390A/URR 
needs improvement, let us know. Send us an 



1 



EIR. You, the user, are the only one who can tell us 
what you don't like about your equipment. Let us know 
why you don't like the design. Tell us why a procedure 
is hard to perform. Put it on an SF 368 (Quality 
Deficiency Report). Mail it to Commander, US Army 
Communications and Electronics Materiel Readiness 
Command, 



ATTN: DRSEL-ME-MQ, Fort Monmouth, NJ 07703. 
We'll send you a reply. 

b. Air Force. Air Force personnel are encouraged 
to submit EIR's in accordance with AFM 900-4. 



Page 31. \ Appendix I | s superseded as follows: 



APPENDIX I 
REFERENCES 



Following is a list of references applicable and available for Radio Receiver R-390A/URR. 

AR 220-10 Preparation for Oversea Movement of Units (POM). 

AR 310-25 Dictionary of United States Army Terms (Short Title: AD). 

AR 310-50 Authorized Abbreviations and Brevity Codes. 

DA Pam 108-1 Index of Army Motion Pictures and Related Audio-Visual Aids. 

DA Pam 3104 Index of Technical Publications: Technical Manuals, Technical 

Bulletins, Supply Manuals (Types 7, 8, and 9), Supply Bulletins and 

Lubrication Orders. 
DA Pam 310-7 US Army Index of Modification Work Orders. 

FM 21-6 How to Prepare and Conduct Military Training. 

FM '1.-30 Military Symbols 

TC 2.-5-7 Training Management in Battalions. 

TM 11-666 Antennas and Radio Propagation. 

TM 11-5820-358-10 Operator's Manual, Radio Receiver R-390A/URR. 
TM 11-6625-203-12 Operator's and Organizational Maintenance: Multimeters AN/ 

URM-105 and AN/URM-105C (Including Multimeter, ME-77/U and 

ME-77C/U). 

TM 11-6625-274-12 Operator's and Organizational Maintenance Manual: Test Sets, 

Electron Tube TB-7/U, TB-7A/U, TV-7B/U, and TB-7D/U. 
TM 38-750 The Army Maintenance Management System (TAMMS). 

TM 43-0139 Painting Instructions for Field Use. 

TM 740-90-1 Administrative Storage of Equipment. 

TM 750-244-2 Procedures for Destruction of Electronics Materiel to Prevent Enemy 

Use (Electronics Command). 
Pages 32 through 37. Appendix II is superseded as follows: 



2 



APPENDIX III 
MAINTENANCE ALLOCATION 



Section I. 

A2-1. General 

This appendix provides a summary of the maintenance 
operations for Radio Receiver R-390AfURR. It 
authorizes categories of maintenance for specific 
maintenance functions on repairable items and 
components and the tools and equipment required to 
perform each function. This appendix may be used as 
an aid in planning maintenance operations. 

A2-2. Maintenance Function 

Maintenance functions will be limited to and defined as 
follows: 

a. Inspect. To determine the serviceability of an 
item by comparing its physical, mechanical, and/or 
electrical characteristics with established standards 
through examination. 

b. Test. To verify serviceability and to detect 
incipient failure by measuring the mechanical or 
electrical characteristics of an item and comparing those 
characteristics with prescribed standards. 

c. Service. Operations required periodically to 
keep an item in proper operating condition; i.e., to clean 
(decontaminate), to preserve, to drain, to paint, or to 
replenish fuel, lubricants, hydraulic fluids, or 
compressed air supplies. 

d. Adjust. To maintain, within prescribed limits, by 
bringing into proper or exact position, or by setting the 
operating characteristics to the specified parameters. 

e. Align. To adjust specified variable elements of 
an item to bring about optimum or desired performance. 

f. Calibrate. To determine and cause corrections 
to be made or to be adjusted on instruments or test 
measuring and diagnostic equipments used in precision 
measurement. Consists of comparisons of two 
instruments, one of which is a certified standard of 
known accuracy, to detect and adjust any discrepancy in 
the accuracy of the instrument being compared. 

g. Install. The act of emplacing, seating, or fixing 
into position an item, part, module 



(component or assembly) in a manner to allow the 
proper functioning of the equipment or system. 

h. Replace. The act of substituting a serviceable 
like type part, subassembly, or module (component or 
assembly) for an unserviceable counterpart. 

/'. Repair. The application of maintenance 
services (inspect, test, service, adjust, align, calibrate, 
replace) or other maintenance actions (welding, 
grinding, riveting, straightening, facing, remachining, or 
resurfacing) to restore serviceability to an item by 
correcting specific damage, fault, malfunction, or failure 
in a part, subassembly, module (component or 
assembly), end item, or system. 

j. Overhaul. That maintenance effort 

(service/action) necessary to restore an item to a 
completely serviceable/operational condition as 
prescribed by maintenance standards (i.e., DMWR) in 
appropriate technical publications. Overhaul is normally 
the highest degree of maintenance performed by the 
Army. Overhaul does not normally return an item to like 
new condition. 

k. Rebuild. Consists of those services/actions 
necessary for the restoration of unserviceable 
equipment to a like new condition in accordance with 
original manufacturing standards. Rebuild is the highest 
degree of materiel maintenance applied to Army 
equipment. The rebuild operation includes the act of 
returning to zero those age measurements (hours, 
miles, etc.) considered in classifying Army equipments/ 
components. 
A2-3. Column Entries 

a. Column 1, Group Number. Column 1 lists group 
numbers, the purpose of which is to identify 
components, assemblies, subassemblies, and modules 
with the next higher assembly. 

b. Column 2, Component/Assembly. Column 2 
contains the noun names of components, assemblies, 
subassemblies, and modules for which 



3 



maintenance is authorized. 

c. Column 3, Maintenance Functions. Column 3 
lists the functions to be performed on the item listed in 
column 2. When items are listed without maintenance 
functions, it is solely for purpose of having the group 
numbers in the MAC and RPSTL coincide. 

d. Column 4, Maintenance Category. Column 4 
specifies, by the listing of a "work time" figure in the 
appropriate subcolumn(s), the lowest level of 
maintenance authorized to perform the function listed in 
column 3. This figure represents the active time 
required to perform that maintenance function at the 
indicated category of maintenance. If the number or 
complexity of the tasks within the listed maintenance 
function vary at different maintenance categories, 
appropriate "work time" figures will be shown for each 
category. The number of task-hours specified by the 
"work time" figure represents the average time required 
to restore an item (assembly, subassembly, component, 
module, end item or system) to a serviceable condition 
under typical field operating conditions. This time 
includes preparation time, troubleshooting time, and 
quality assurance/quality control time in addition to the 
time required to perform the specific tasks identified for 
the maintenance functions authorized in the 
maintenance allocation chart. Subcolumns of column 4 
are as follows: 

C - Operator/Crew 
O -Organizational 
F - Direct Support 
H - General Support 
D - Depot 

e. Column 5, Tools and Equipment. Column 5 
specifies by code, those common tool sets (not 



individual tools) and special tools, test, and support 
equipment required to perform the designated function. 

f. Column 6, Remarks. Column 6 contains an 
alphabetic code which leads to the remark in | section 171 
Remarks, which is pertinent to the item opposite the 
particular code. 

A2-4. Tool an d Test Equipment Requirements 
IfSecTTTt 

a. Tool or Test Equipment Reference Code. The 
numbers in this column coincide with the numbers used 
in the tools and equipment column of the MAC. The 
numbers indicate the applicable tool or test equipment 
for the maintenance functions. 

b. Maintenance Category. The codes in this 
column indicate the maintenance category allocated the 
tool or test equipment. 

c. Nomenclature. This column lists the noun name 
and nomenclature of the tools and test equipment 
required to perform the maintenance functions. 

d. National/NATO Stock Number. This column 
lists the National/NATO stock number of the specific 
tool or test equipment. 

e. Tool Number. This column lists the 
manufacturer's part number of the tool followed by the 
Federal Supply Code for manufacturers (5-digit) in 
parentheses. 



A2-5. Remarks [(Sec jy) 

a. Reference Code. This code refers to the 
appropriate item ir j section lT] column 6. 

b. Remarks. This column provides the required 
explanatory informati on necessary to clarify items 
appearing ir l section Ml 



4 



SECTION II. MAINTENANCE ALLOCATION CHART 

FOR 

RADIO RECEIVER R-390A/URR 



(1) 


(2) 


(3) 






(4) 






(5) 


(6) 








MAINTENANCE CATEGORY 






GROUP 


COMPONENT/ 


MAI NT. 












TOOLS AND 




NUM 


ASSEMBLY 


FUNCTION 


C 





F 


H 


D 


EQUIPMENT 


REMARKS 


00 


RADIO RECEIVER R-390A/URR 


Inspect 

Inspect 

Service 

Test 

Test 

Adjust 
Align 


0.1 


0.2 
0.2 
0.4 


2.0 
1 .0 


1.0 




18 
18 

10,16,18 

2,3,5,7, 

9,11,12, 

16,17,19 

20 

5,11,12, 

17,19,20 

1,2,5 

thru 9. 

12,13,14 

16,17,19, 

20 


B 

D 

C 






Repair 






6.0 






2,3,5,7, 


















9,11,12, 

16,17,19, 

20 








Install 




1.0 








18 








Overhaul 










24.0 


1,4 thru 
7,9.11,. 
12,15,17, 




















19,20 




01 


RECEIVER ASSEMBLY 
SMD343619 (A1) 














A 


0101 


AUDIO ASSEMBLY 
SMD248801 (A1A2) 
(AF SUBCHASSIS) 
















A 


0102 


AMPLIFIER, INTERMEDIATE 
FREQUENCY 

SMD343620 (A1A3) 
















A 


010201 


AMPLIFIER SUBASSEMBLY 
SMC343621 (A1A3A4) 
















A 


0103 


AMPLIFIER, RADIO 
FREQUENCY 

SMD343629 (A1A7) 
(RF SUBCHASSIS) 
















A 


0104 


OBCILLATOR ASSEMBLY 
SMD249007 

CRYSTAL-OSCILLATOR 
SUBCHASSIS) 
















A 


0105 


GER ASSEMBLY 


Repair 






0.5 






17,19 






SMD343600 (A1A9) 


Repair 










1.3 


17,19 






(RF GEAR TRAIN) 
















0106 


POWER SUPPLY 
SMD248984 (A1A5) 
(POWER SUPPLY 
SUBCHASSIS) 
















A 


0107 


RADIO FREQUENCY 
SMD34362E (A1A6) 
(VFO SUBCHASSIS) 
















A 


0108 


PANEL ASSEMBLY,FRONT 
SMD249134 (AA9S) 
















A 


0109 


PANEL ASSEMBLY 
SMD343623 (A1A37) 
(CHASSIS) 
















A 



5 



SECTION III. TOOL AND TEST EQUIPMENT REQUIREMENTS 

FOR 

RADIO RECEIVER R-390A/URR 



Tool or Test 










Equipment 


Maintenance 




National/NATO 


Tool 


Ref Code 


Category 


Nomenclature 


Stock Number 


Number 


1 


H,D 


ANALYZER, SPECTRIM TS-723D/U 


6625-00-668-9418 




2 


F,H 


AUDIO OSCILLATOR TS-382/U 


6625-00-151-7479 




3 


F 


FREQUENCY METER AN/URM-32 


6625-00-553-0060 




4 


D 


FREQUENCY METER AN/USN-26A 


6625-00-543-1356 




5 


F,H,D 


GENERATOR, SIGNAL AN/URM-25D 


6225-00-649-5193 




6 


H,D 


GENERATOR, SIGNAL AN/USN-44A 


6625-00-539-9685 




7 


F,H,D 


HEADSET HS-30/U 


5965-00-164-7259 




8 


H 


LIGHT ASSEMBLY, ELECTRIC NX-1292/PAQ 


6695-00-378-5449 




9 


F,H,D 


MAINTENANCE KIT, ELECTRONIC EQUIPMENT 
MK-288/URM 


6625-00-557-5716 




10 





MULTIMETER AN/URM-105C 


6625-00-999 6282 




11 


F.D 


MULTIMETER TS-352B/U 


6625-00-553-0142 




12 


F.H,D 


MULTIMETER, ELECTRONIC TS-505/U 


6625-00-243-0562 




13 


H 


OSCILLOSCOPE OS-8/U 


6625-00-643-1740 




14 


H 


OUTPUT METER TS-585C/U 


6625-00-244-0501 




15 


D 


TEST SET, ELECTON TUBE TV-2D/U 


6625-00-669-0263 




16 


0,F,H 


TEST SET, ELECTRON TUBE TV-7D/U, 


6625-00-820-0064 




17 


F,H,D 


TOOL KIT, ELECTRONIC EQUIPMENT TK-100/G 


5180-00-605-0079 




18 





TOOL KIT, ELECTRONIC EQUIPMENT TK-101/G 


5180-00-064-5178 




19 


F,H,D 


TOOL KIT, ELECTRONIC EQUIPMENT TK-105/U 


5180-00-610-8177 




20 


F,H,D 


VOLTMETER, ELECTRONIC ME-30E/U 


6625-00-643-1670 





6 



SECTION IV. REMARKS 



REFERENCE 




CODE 


REMARKb 


A 


ALL COMPONENTS WITH NO MAINTENANCE FUCTIONS INDICATED, ARE REPAIRED UNDER 




THE NECT HIGHER ASSEMBLY/END ITEM. 


B 


EXTERNAL VISUAL 


C 


PERFORMANCE CHECK. 


D 


CRYSTALS, KNOBS, FUSES, LAMPS, TUBES REPLACED AT ORGANIZATIONAL LEVEL. 



7 



By Order of the Secretary of the Army: 
Official: 



E. C. MEYER 

General, United States Army 
Chief Staff 



J. C. PENNINGTON 

Major General, United States Army 
The Adjutant General 



Distribution: 

To be distributed in accordance with DA Form 1261, Organizational Maintenance requirements for R390/URR, R- 
390A/URR. 



Changes In force: C 2 and C 3 



TM 11-5820-358-20 
C3 



CHANGE -| HEADQUARTERS 

y DEPARTMENT OF THE ARMY 

No. 3 J WASHINGTON, DC, 3 April 1975 



Organizational 'Maintenance Manual 
RADIO RECEIVER R-390/AURR 

TM 11-5820-35820, 10 February 1961, is changed as follows: 
Inside front cover. Radiation warning is added after existing notice. 



1 



WARNING 
RADIATION HAZARD 



RADIOACTIVE MATERIAL 
CONTROLLED DISPOSAL REQUIRED 
ACCOUNTABILITY NOT REQUIRED 

STD RW--2 

Audio level meter RA226 0.69uCi 6625-00-669-0769 

Audio level meter Ra 226 0.4OuCi 6625-00-669-0770 

Electron Tube OA2WA 5960-00-503-4880 
EEVC U238 0.1 uCi 

CBS Hytron Ni 63 0.5uCi 

Raytheon Co 60 0.2uCi 

Radiation Hazard Information: The following radiation hazard information must be read and 
understood by all personnel before operating or repairing the Radio Receiver R-390A/URR. 
Hazardous radioactive materials are present in the above listed components of R-390A/URR. 
The components are potentially hazardous when broken. See qualified medical personnel and 
the local Radiological Protection Officer (RPO) immediately, if you are exposed to or cut by 
broken components. First aid instructions are contained in TB 43-0116, TB 43-0122, and AR 755- 
15. 

NEVER place radioactive components in your pocket. 

Use extreme care NOT to break radioactive components while handling them. 

NEVER remove radioactive components from cartons until you are ready to use them. 

If any of these components are broken, notify the local RPO immediately. The RPO will survey 

the immediate area for radiological contamination and will supervise the removal of broken 

components. 

The above listed radioactive components will not be repaired or disassembled. 

Disposal of broken, unserviceable, or unwanted radioactive components will be accomplished in 

accordance with the instructions in AR 755-15. 



2 



By Order of the Secretary of the Army: 

FREDC. WEYAND 
General, United States Army 
Official: Chief of Staff 



VERNE L. BOWERS 

Major General, United States Army 

The Adjutant General 



Distribution: 

To be distributed in accordance with DA Form 12-51, (qty rqr block No. 902) Organizational Maintenance 
requirements for R-390A/URR. 



3 



Changes in force: C 2 
TECHNICAL MANUAL 



TM 11-5820-358-20 

*C2 



Organizational Maintenance Manual 
RADIO RECEIVER R-390A/URR 



TM 11-5820-358-20 
CHANGES No. 2 



} 



HEADQUARTERS, 
DEPARTMENT OF THE ARMY 
WASHINGTON, D.C., 23 August 1963 



TM 11-5820-358-20, 10 February 1961, is changed as follows 
Page 3. Add paragraph 1.1 alter paragraph 1. 
1.1. Index of Publications 

Refer to the latest issue of DA Pam 310-4 to 
determine whether there are new editions, changes, or 
additional publications pertaining to the equipment. DA 
Pam 310-4 is an index of current technical manuals, 
technical bulletins, supply bulletins, lubrication orders, 
and modification work orders which are available 
through publications supply channels. The index lists 
the individual parts (-10, -20, -35P, etc.) and the latest 
changes to and revisions of each equipment publication. 



Delete paragraph 2 and substitute: 



2. 



Forms and Records 

a. Reports of Maintenance and Unsatisfactory 
Equipment. Use equipment forms and records in 
accordance with instructions in TM 38-760. 

b. Report of Damaged or improper Shipment. Fill 
out and forward DD Form 6 (Report of Damaged or 
Improper Shipment) as prescribed in AR 700-58 (Army), 
NAVSANDA Publications 378 (Navy), and AFR 71-4 (Air 
Force). 

c. Comments on Manual. Forward all comments 
on this publication direct to: Commanding Officer, U.S. 
Army Electronics Materiel Support Agency, ATTN: 
SELMS-MP, Fort Monmouth, N.J. DA Form 1598 
(Record of Comments on Publications), DA Form 2496 
(Disposition Form), or letter may be used. 



'These change supersede C1, 11 October 1961. 
TAGO 387A-Sept. 700-469°-63 



Page 16. Delete paragraph 11 and substitute: 

1 1 . Preventive Maintenance 

a. Preventive maintenance is the systematic care, 
inspection, and servicing of equipment to maintain it in 
serviceable condition, prevent breakdowns, and assure 
maximum operational capability. Preventive 
maintenance is the responsibility of all echelons 
concerned with the equipment and includes the 
inspection, testing, and repair or replacement of parts, 
subassemblies, or units that inspection and tests 
indicate probably would fail before the next scheduled 
periodic service. Preventive maintenance checks and 
services of Radio Receiver R-390A/URR at the second 
echelon level are made quarterly unless otherwise 
directed by the commanding officer. 

b. Maintenance forms and records to be used and 
maintained on this equipment are specified in TM 38- 
750. 

Add paragraphs 11.1 and 11.2 after paragraph 

11. 

11.1. Quarterly Maintenance 

Quarterly preventive maintenance checks and 
services on Radio Receiver R-390A/URR are required. 
Periodic daily services (TM 11-5820358-10) constitute a 
part of the quarterly preventive maintenance checks and 
services and must be performed concurrently. All 
deficiencies or shortcomings will be recorded in 
accordance with the requirements of TM 38-750. 
Perform all the checks and services listed in the 
quarterly preventive maintenance checks and services 
chart (par. 1 1 .2) in the sequence listed. 



1 1 .2. Quarterly Preventive Maintenance Checks and Services Chart 



Sequence 
No. 



Item 



Procedure 



References 



1 

2 
3 

4 

5 

6 

7 

8 

9 

10 
11 
12 
13 



Completeness 

Publications 

Modifications 

Preservation 

Loose components 
Pluckout items 

Relay 

Resistors 

Terminal blocks- 
Capacitors 

Transformers 

Operation 

Lubrication 



See that equipment is complete 

See that all publications are complete, serviceable, and 
current. 

Determine whether new applicable MWO's have been 
published. All URGENT MWO's must be applied 
immediately; all NORMAL MWO's must be sched- 
uled. 

Check all surfaces for evidence of fungus. Remove rust 

and corrosion, and paint bare spots. 

Inspect knobs, jacks, switches, relay, transformers, pilot 

lamps, and connectors for looseness. 

Inspect seating of tubes, lamps, fuses, crystal, and 

connectors. 

Inspect relay for loose mounting, bad contacts, and 
spring tension. 

Inspect resistors for cracks, chipping, blistering, and dis- 
coloration 

Inspect terminal blocks for cracks, loose connections, 
and breaks. 

Inspect capacitors for corrosion, dirt, and loose connections, 

Inspect transformers and chokes for overheating 

Check for normal operation 

Check the receiver for lubrication 



Appx II, TM 11-5820- 
358-10. 

DA PAM 310-4. 

TM 38-750 and DA 
Pam 310-4. 



TM 9-213. 



Par. 15. 
Par. 12. 



Page 17 and 18. Delete figures 8 and 9. 

Page 31. Add the following to appendix I: 
TM 0-213 Painting Instructions for Field Use. 
TM 38-750 The Army Equipment and 



Record System Procedures. 
Page 32 through 37. (As changed by C 1 , 1 1 Oct 61 ). 
Delete appendix II and substitute the following: 



APPENDIX II 
MAINTENANCE ALLOCATION 
Section I. INTRODUCTION 
1. General in top-down 

a. This appendix assigns maintenance functions to 
be performed on components, assemblies, and 
subassemblies by the lowest appropriate maintenance 
echelon. 

b. Columns in the maintenance allocation chart re 
as follows: 

(1) Component. This column shows only the 
nomenclature or standard item name. 
Additional descriptive data re included (2) 
only where clarification is necessary to 
identify the component. Components, 
assemblies, and subassemblies are listed 



order. That is, the assemblies which re part 
of a component are listed immediately 
below that component, and the 
subassemblies which are part of an 
assembly are listed immediately below 
that assembly. Each generation 
breakdown (components, assemblies, or 
subassemblies) are listed in disassembly 
order or alphabetical order. 
Maintenance function. This column 
indicates the various maintenance 
functions allocated to the echelons, 
(a) Service. To clean, to preserve, and 
to replenish lubricants. 



TAGO 387A 



2 



(b) Adjust. To regulate periodically to 
prevent malfunction. 

(c) Inspect. To verify serviceability and 
to detect incipient electrical or 
mechanical failure by scrutiny. 

(d) Test. To verify serviceability and to 
detect incipient electrical or 
mechanical failure by use of special 
equipment such as gages, meters, 
etc. 

(e) Replace. To substitute serviceable 
components, assemblies, or 
subassemblies, for unserviceable 
components, assemblies, or 
subassemblies. 

(f) Repair. To restore an item to 
serviceable condition through 
correction of a specific failure or 
unserviceable condition. This 
function includes but is not limited 
to welding, grinding, riveting, 
straightening, and replacement of 
parts other than the trial and error 
replacement of running spare type 
items such as fuses, lamps, or 
electron tubes. 

(g) Align. To adjust two or more 
components of an electrical system 
so that their functions are properly 
synchronized. 

(h) Calibrate. To determine, check, or 
rectify the graduation of an 
instrument, weapon, or weapons 
system, or components of a 
weapons system. 

(i) Overhaul. To restore an item to 
completely, serviceable condition as 
proscribed by serviceability 
standards developed and published 
by heads of technical services. This 
is accomplished through 
employment of the technique of 
"Inspect and Repair Only as 
Necessary" (IROAN). Maximum 
utilization of diagnostic and test 
equipment is combined with 
minimum disassembly of the item 
during the overhaul process. 

(j) Rebuild. To restore an item to a 
standard as near as possible to 
original or new condition in 
appearance, performance, and life 
expectancy. This is accomplished 
through the maintenance 



technique of complete disassembly 
of the item, inspection of All parts or 
components, repair or replacement 
of worn or unserviceable elements 
using original manufacturing 
tolerances and/ or specifications 
and subsequent reassembly of the 
item. 

(3) 1st, 2d, 3d, 4th, and 5th echelon. The 
symbol X indicates the echelon 
responsible for performing that particular 
maintenance operation, but does not 
necessarily indicate that repair parts will 
be stocked at that level. Echelons higher 
than the echelon marked by X are 
authorized to perform the indicated 
operation. 

(4) Tools required. This column indicates 
codes assigned to each individual tool 
equipment, test equipment, and 
maintenance equipment referenced. The 
grouping of codes in this column of the 
maintenance allocation chart indicates the 
tool, test, and maintenance equipment 
required to perform the maintenance 
function. 

(5) Remarks. Entries in this column will be 
utilized when necessary to clarify any of 
the data cited in the preceding columns. 

c. Columns in the allocation of tools for 
maintenance functions are as follows: 

(1) Tools required for maintenance functions. 
This column lists tools, test, and 
maintenance equipment required to 
perform the maintenance functions. 

(2) 1st, 2d, 3d, 4th, and 5th echelon. The 
dagger (t) symbol in these columns 
indicates the echelons normally allocated 
the facility. 

(3) Tool code. This column lists the tool code 
assigned. 

2. Maintenance by Using Organizations 

When this equipment is used by signal services 
organizations organic to theater headquarters or 
communication zones to provide theater 
communications, those maintenance functions allocated 
up to and including fourth echelon are authorized to the 
organization operating this equipment. 



TAGO 387A 



3 



Section II. MAINTENANCE AL 


LOCAT 


ON CHART 






Maintenance 


1 st 




3 rd 


4 th 


5 th 


Tools 




Parts or component 




function 


ech. 


ech. 


ech. 


ech. 


ech. 


required 


Remarks 


(1) 




(2) 


(3) 


(4) 


(5) 


(6) 


(7) 


(8) 


lew 

(9) 


RECEIVER, RADIO R-390A/ 




service 




X 








4,13,16 




URR. 




Inspect— 


X 












Preventive mainte- 
nance. 






— 


— 


— 








replace — 




X 
















— 




— 


— 










repair- 






X 






2,4,5,6,7,8,9,1 0, 
11,12, 14, 17 








align 




.__ 




X 


.__ 


1,2,4,5,6,7,8,10, 

1-4 A r\ a a 4 r An A c\ 

1 ,12,14,1 5,18,19 








rebuild 


— 


— 


— 


— 


X 


1,2,3,5,6,7,8,10, 
11,12,14,16,18,19 




A K yiDI II — II — n A 1 — 

AMPLIFIER, AF 




replace — 
repair - 


— 


— 


X 
X 


— 


— 


4,14 

2,5,6,7,8,9,10, 
11,12,14,17 




a k yini i r~ ii — n i r~ 

AMPLIFIER, IF 




replace — 
repair- 


— 


— 


X 
X 


— 


— 


4,14 

2,4,5,6,7,8,9,10, 
11,12,14,17 




Afi/ini irirn n r~ 

AMrLlhlLH, R.I- . 




replace — 
repair— 






X 
X 






4,14 

2,4,5,6,7,8,9,10, 
11,12,14,17 




OSCILLATOR, R.F 




replace — 
repair- 


— 


— 


X 


X 


— 


4,14 

2,4,5,6,7,8,10,11, 

HO A A IK HQ HQ 




OSCILLATOR, R.F. (VARI- 




replace — 






X 






4,14 




ABLE). 




Repair 








X 




2,4,5,6,7,8,10,11, 
12,14,15,18,19 




POWER SUPPLY 




replace 

repair— 






X 
X 






4,14 
4,6,10,14 





Section III. ALLOCATION OF TOOLS FOR MAINTENANCE FUNCTIONS 



(1) 

Tools required for maintenance functions 



(2) 

1st 
eche- 
lon 



(3) 

2d 
eche- 
lon 



(4) 

3d 
eche- 
lon 



(5) 

4th 
eche- 
lon 



(6) 

5th 
eche- 
lon 



(7) 

Tool 
code 



(8) 
Remark 



RECEIVER, RADIO R-390A/URR 

SPECTRUM ANALYZER TS-723/U 

AUDIO OSCILLATOR TS-382/U 

TEST SET, ELECTRON TUBE 

TEST SET, ELECTRON TUBE TV-7/U- 

LOUDSPEAKER LS-3 

MULTIMETER TS-352/U 

ELECTRONIC MULTIMETER TS-505/U 
SIGNAL GENERATOR AN/URM-25 

FREQUENCY METER AN/URM-32 

VOLTMETER, METER ME-30/U 

ACCESSORY KIT MK-288/URM 

TEST ADAPTER MX-1487/URM-25D— - 

TOOL KITTK-115/G 

TOOL KITTK-87/U 

TOOL KITTK-88/U 

MULTIMETER AN/URM-105 

POWER SUPPLY PP-1243/U 

FREQUENCY METER AN/URM-79 

FREQUENCY METER AN/URM-80 



(t) 


1 


(t) 


2 


(t) 


3 




4 


(f) 


5 


(t) 


6 


(t) 


7 
8 


(t) 


9 


(t) 


10 


(t) 


11 


(f) 


12 




13 


(t) 


14 


(t) 


15 




16 




17 


(t) 


18 


(t) 


19 



TAGO 387A 



By Order of the Secretary of the Army: 



Official: 

J. C. LAMB1ERT, 

Major General, United State Army, 

The Adjutant General. 



EARLEG. WHEELER, 

General, United States Army, 
Chief of Staff. 



Distribution: 
Active Army: 
DABA (6) 
USASA (2) 
CNGB(1) 
CofEngrs (1) 
TSG (1) 
CSigO (7) 
CofT (1) 
CSptS (1) 
USA CD Agcy (1) 
USCONARC (5) 
USAMC (5) 
ARADCOM (2) 
ARADCOM Rgn (2) 
OS Maj Comd (3) 
OS Base Comd (2) 
LOGCOMD (2) 
USAECOM (5) 
U8AMICOM (4) 
USASCC (4) 
MDW (1) 
Armies (2) 
Corps (2) 
USA Corps (3) 
USATC AD (2) 
USATC Engr (2) 
USATC Inf (2) 
USATC Armor (2) 
USASTC (5) 

NG: State AG (3); unites-same 

USAR: None. 

For explanation of abbreviation 



Instl (2) except 

Ft Monmouth (83) 
Svc Colleges (2) 
Br 8vo 8ch (2) except 

GENDEP (OS) (2) 
Sig Dep (OS) (12) 
SigScc, GENDEP (5) 
Army Dep (2) except 

Ft Worth (8) 

Lexington (12) 

Sacramento (28) 

Tobyhanna (12) 
USMA (5) 

USA Big Comm Scty Agcy (5) 
USA Elct RD Actv, White 8ndo 
(13) 

USA Elct RD Actv, Ft Huachuca 
(2) 

USA Trans Tml Comd (1) 

Army Tml (1) 

POE (1) 

USAOSA (1) 

AMS (1) 

WRAMC (1) 

AFIP (1) 

Army Pie Cen (2) 
USAMbl 8ptCen (1) 
USA Elct Mat Agcy (12) 
as active Army except allowance i one (1) 

used, see AR 320-50. 



Chicago Proc Dist (1) 

USARCARIB 81 ig Agcy (1) 

Sig Fid Maint Shop (3) 

Unite organized under following 
TOE's (2 copies each unless 
otherwise indicated): 

5-15 

5- 16 

6- 615 
6-619 
11-7 
11-16 
11-57 
11-85 
11-98 
11-116 
11-117 
11-155 
11-157 

11-500 (AA-AC) (4) 
11-567 
11-587 
11-592 
11-b97 
32-51 
32-56 
32-57 
32-78 
copy to each unit. 



TAGO 387A 



5 



*TM 1 1-5820-358-20/TO 31 R1-2URR-442 



TECHNICAL MANUAL "I DEPARTMENTS OF THE ARMY 

No. 11-5820-358-20 K, AND THE AIR FORCE 

TECHNICAL ORDER I 

No. 31R1-2URR-442 J WASHINGTON 25, D. C, 10 February 1961 



RADIO RECEIVER R-390/URR 



Paragraph Page 



I CHAPTER _TJ 



INTRODUCTION 

Scope IT 

Forms and records [2 



I CHAPTER ~2~1 



I CHAPTER 



Section 



3 



CHAPTER 



INSTALLATION 

Unpacking 

Checking Unpacked Equipment. 

Shelter requirements 

Installing receiver 

Connecting receiver 



MAINTENANCE INSTRUCTIONS 
General 

Scope of second echelon maintenance [8 

Tools, materials, and test equipment required 9 

Special tools supplied EQ 

Preventive maintenance U_T 

Lubrication 12 

Troubleshooting 

Visual inspection |T8 

Overall operational test 14 

Equipment performance checklist L5 

Supplementary equipment performance checklist information IT6 

Tube-testing techniques 17 

Power-supply subchassis removal and replacement 18 

Af subchassis removal and replacement q9 

Removal and replacement of crystal oven HR202 during maintenance 20 

Disassembly and assembly of crystal oven HR202 to replace crystals 21_ 

Removal and replacement of crystals under HR401 crystal oven cover 22 

Removal and replacement of incandescent lamps |23 



SHIPMENT AND LIMITED STORAGE AND DEMOLITION TO 
PREVENT ENEMY USE 





4 




[|8 




8 




10 




15 




EHlfiE 



28 
28 



This manual supersedes so much of TM 11-856A, 20 January 1956, including C1, 19 March 1956; C2, 17 May 
1956; C3, 23 November 1956; C4, 7 June 1957; CS, 23 July 1958, and C6, 13 November 1958, as pertains to 
organizational maintenance of subject equipment. 



1 



Section 



APPENDIX 



Shipment and limited storage 

Disassembly 

Repacking for shipment or limited storage 
Demolition of material to present enemy use 

Authority for demolition 

Methods of destruction 

REFERENCES 

MAINTENANCE ALLOCATION 



CHAPTER 1 
INTRODUCTION 



1. Scope 

This annual covers the installation and second 
echelon maintenance of Radio Receiver R490A/URR. 
The operating instructions for this equipment are 
contained in TX 11-5820-858-10. 



2. Forms and Records 

Forward comments concerning this manual to 
the Commanding Officer, U. S. Army Signal Materiel 
Support Agency, ATTN: SIGMSPA2d, Fort Monmouth, 
N. J. 

Note. For applicable form and 
records, see paragraph 2, TM 11- 
5820-358-10. 



3 



CHAPTER 2 
INSTALLATION 



3. Unpacking 

a. Packaging Data. When packed for shipment, 
the components of the receiver are placed in a water- 
vaporproof container and packed in a wooden box. An 
exploded view of th e wooden box and its contents is 
shown in [figure 1 . 1 The dimensions of the box are 
approximately 241/4 inches high, 201/2 inches wide, 
and 14 3/4 inches deep. The packed box weighs 
approximately .100 pounds, with a volume of 3.9 cubic 
feet. 

b. Removing Contents. Select a location where 
the eguipment may be unpacked without exposure to 
the weather, and which is convenient to the place of 
installation. 

CAUTION: Be careful when 
uncrating, unpacking, and handling 
the equipment, because it is easily 
damaged. 

(1) Place the packing case conveniently near 
the installation location. 

(2) Cut and fold back the metal straps. 

(3) Remove the nails with a nailpuller. 

(4) Remove the top and one side of the 
wooden box. 

(5) Remove the desiccant bags, the 
cardboard tray, and the plywood board. 

(6) Take out the outer cardboard carton that 
contains the receiver. 

(7) Open the carton and withdraw the inner 
carton that is enclosed in the moisture- 
vaporproof barrier. 

(8) Slit open the seams of the moisture 
vaporproof barrier and open the inner 
cardboard carton. 

(9) Remove any spacers or padding from the 
inner cardboard carton. 

(10) Withdraw the receiver from the inner 
carton and place it on a workbench near 
its final location. 

(11) Remove the te chnical manuals and the 
running j pares. I 



4. Checking Unpacked Equipment 

a. Check the contents of the cartons against the 
master packing slip. 

b. Check the receiver front panel for damage to 
the knobs, the glass meter windows, and the freguency- 
indicator dial. 

c. Operate the control knobs; examine them for 
looseness. 

d. Turn the MEGACYCLE CHANGE and the 
KILOCYCLE CHANGE controls throughout their range. 
Rough operation or binding indicates a damaged tuning 
system. 

e. Remove the top and bottom dust covers by 
removing the 16 screws (TM 11-5820-358-10) and 
lockwashers that secure the covers to the main frame. 

f. Inspect the subchassis on the upper and lower 
decks of the receiver for' loose connectors, loose tube 
shields, and broken tubes as follows: 

(1) See that all connectors are seated firmly. 

(2) If the receiver is to be used in a fixed 
install ation, re move the shields from all 
tubes |(fig. 2] and [3)1 except V201 through 
V206, V505, and V701 . 

(3) Unless extremely dusty conditions are 
expected, do not replace the dust covers. 

(4) Do not replace the dust covers if the 
receiver is to be installed in Cabinet CY- 
979/URR or Cabinet CY-917/ URR. 

g. Remove the fuse from the fuseholder on the 
rear panel (TM 11-5820-358-10) marked AC 3 AMP. 
Check the position of the OVENS switch on the rear 
panel. Refer to the chart below for the proper fuse 
rating. 

CAUTION: To avoid serious damage 
to the 



4 



WOODEN COVER 




OESICCANT BAGS 



CARDBOARD TRAY 



PLYWOOO BOARD 



CARDBOARD TUBING 
OVER KNOBS 



MOISTURE 
INDICATOR 
CARO 



MASKING TAPE 



REAR CARDBOARD PAD 



TECHNICAL MANUALS 
AND CARTON 



CARTON 



WOODEN BOX 



METAL STRAPS 




RADIO RECEIVER 
R-390A/URR 



CARDBOARD PADS 



INNER 

CARDBOARD CARTON 



WATERPROOF BARRIER 



OUTER 

CARDBOARO CARTON 



KIMPAC PAD 



RUNNING SPARES 



PACKING LIST , ENVELOPE 
AND PROTECTOR 



TM5B2O-358-2O-20 



Figure 1. Packaging. 



5 



1ST IF AMPL 

V90I 
9T4f/68*6W 



UMITER 
VSOT 
MI4A 



AGC RECTIFIER 

a 

IF CATHODE FOLLOWER 
91I4A 



CRYSTAL OVEN 
HR202 




CLAMP 

1ST CRYSTAL OSCILLATOR 
VtOT 

MI4/MK91 



CALIBRATION OSCILLATOR 
» 

IOO-KC CATHODE FOLLOWER 
vim 
MI4A 



IOO-KC MULTIVIBRATOR 
VtM 



AGC TIME CONSTANT TUBE 

a 

DETECTOR 
VS04 
MI4A 



4TH If AM PL 
V904 
•AIM 



Figure 2. Radio Receiver R-390A/URR, top deck, tube, and crystal location. 

6 



TMMtO-Mf'tO-l 




Figure 3. Radio Receiver R-390A/URR, bottom deck, tube, and subchassis location. 

7 



receiver, do not use any fuse other than the value 
specified. 



Ac source 


OVENS switch 


Fuse rating 


voltage 


position 


in amperes 


115-volt 


ON 


3 


115-volt, 


OFF 


2 


230-volt 


ON 


1 1/2 


280-volt 


OFF 


1 



Note. Receivers bearing order No. 
14-Phila-56, serial numbers 2688 and 
above, and order No. 14385-Phila-58 
have a 1/4-ampere and a 1/8-lmpere 
B+ fuse on the rear panel for 
protection against short circuits In 
the B+ circuits. 



h. Inspect for bent or broken connector and 
terminals on the rear panel. See that the special tools 
are in place in their holders, and that the spare fuses 
are-of proper rating and clipped firmly to the rear panel 
(TM 11-5820-58-10). 

/'. Check the contents of the running spares box 
for damaged parts. 
5. Shelter Requirements 

The shelter housing should be sufficiently weathertight 
to protect the equipment.. The shelter should allow 
enough room for free air circulation. 



NUT 



CASKET 



CLAMP 



MALE CONTACT PLUS MOV 



SLBE NOT AND CASKET OVER CABLE. 
I REMOVE VtNVL JACKET FOR %M INCH. 
00 NOT NICK BRAIO. 



COMB OUT BRAIO ANQ FOLD OUT. 
I CUT DIELECTRIC TO Vt MCH AMD 
BARE CENTER CONDUCTOR V« MCH. 



PULL BRAIO FORWARD ANO TAPER 
SLIDE CLAMP OVER BRAIO. 



FOLD BACK BRAID, TRIM TO PROPER 
4 LENGTH ANO FORM OVER CLAMP AS 
SHOWN. SOLDER CONTACTS TO CENTER 
CONDUCTOR, NOTE Vw MCH DIMENSION. 




CABLE MCLECTMC 
CENTER CONDUCTOR 



MSERT CABLE AND PARTS INTO CONNECTOR BODY. 
. MAKE SURE SHARP EOBE OF CLAMP SEATS 
s PROPERLY IN BASKET. END OF CONTACT SHOULD 

BE FLUSH WITH INSULATION. 

TM5B20-35B-20-4 



Figure 4. Assembly of Connector Plug Ug-573/U on coaxial cable. 



8 



6. Installing Receiver 

a. Antenna. The receiver is frequently used with a 
rhombic, doublet, or double-doublet antenna. 

(1) For information concerning rhombic and 
doublet antennas, refer to TM 1 1 -666. 

(2) For double-doublet information, refer to 
TM 11-2629. 

b. Assembling Connector Plug UG-573/U. I Figurel 
[4]gives complete instructions for assembling Connector 

Plug UG-573/U or Connector Plug P-259. 

c. Receiver. The receiver is shipped with all tubes, 
crystals, and fuses in place. When the receiver is to be 
used as part of a system, refer also to the system 
technical manual for instructions. 

(1) Fixed, tabletop installation. The receiver 
is housed in Cabinet CY-917/ URR or in a 
similar well-ventilated case for fixed 
operation. 

(a) Place the receiver on any sturdy 
table or bench. 



(2) 



TO SALANCED 
t-WIRe ANTENNA 




TO UNBALANCED 
Sm«Ll WIRE ANTCNNA 



(b) Use the receiver without the top and 
bottom dust covers and without the 
tube shields foara 4$ ). 
Fixed, rack installation. To install the 
receiver in a standard rack, proceed as 
follows: 

(a) Remove the top and bottom dust 
covers. 

(b) Remove the tube shields as 
directed in (b) above. 

(c) Remove one of the blank panels 
from the rack. 

(d) Install the angle brackets that come 
with the rack for received support. 

(e) Slide the receiver into place. 

(f) Insert the bolts, which were 
removed from the blank panel, 
through the elongated holes located 
along the vertical edges of 



TO fREOUENCT 
IHIFT CONVERTER 



I 



PLU4 CONNECTOR 
Uf-4tl/U 

OR 
IM-tM/U 



ANTENNA 



J 10* WHIP 
UNBALANCED 




RUM 
Ut-M/U 



COO-OHM 
SPEAKER 

TOIM/EfO — 
VOLT* AC 




LINE . 



j ~AUD IO~ 1 

io T^i* 

wm 



POWER 
root 




•ALANCEO 100-OHU 

AUDIO LINE TO 
AUXILIARY EQUIPMENT 



TM»eeO-»B«-lO-5 



Figure 5. Cording diagram. 



9 



receiver with the spe cified tube 



(3) 



the receiver front panel. (TM 
115820-358-10). 
Mobile, tabletop installation. To install the 
receiver for mobile operation when 
housed in Cabinet CY979/URR, proceed 
as follows: 
(a) Bolt the cabinet securely to a table 
or shelf that is fastened rigidly to the 
vehicle. 

Allow space for ventilation, for 
access to the connections on the 
rear panel, and for withdrawal of the 
receiver from the cabinet for 
servicing. 

Remo ve the t op and bottom dust 
covers [(para 4| e). 

Remove the blank panel from the 
cabinet and install the receiver. 
Secure the front panel to the 
cabinet, with the bolts removed 
from the blank panel. 
Mobile, cabinet, or rack installation. To 
install the receiver in Electrical Equipment Cabinet CY- 
1216/U, securely bolt the receiver cabinet or rack to the 
body of the vehicle. 

(5) Ventilation. In all installations, provide as 
much ventilation as possible. 

(a) Do not use the receiver with the 
dust covers in place unless 
extremely dusty or sandy conditions 
exist. 

For tabletop cabinets, remove the 
dust covers before the receiver is 
installed. 

In fixed installations, operate the 



(b) 

(c) 
(d) 
(e) 



(4) 



(b) 



(c) 




shields removed ! (para 4r ). 

(d) Allow as much space as possible at 
the back of the cabinet or rack for 
air circulation. 

(e) When more than one receiver is 
housed in a cabinet, always use a 1 
3/4-inch or larger blank strip 
between the receivers. 

(6) Support. For mobile installations, provide 
support for the lower rear of the receiver. 
This support is provided in the cabinets 
listed in (3) and (4) above. For other 
cabinets, use the mounting holes that are 
provided at the rear of the receiver. 
Dowel pins may be inserted to hold the 
receiver securely. The drawing of the 
rear panel of the receiver (TM 11-5820- 
358-10) shows the locations and 
dimensions of the dowel pin gussets 
(lower corners). 
7. Connecting Receiver Rfiq. 5| [4] and[7j| 

The receiver will operate from either 115 or 230 
volts ac. The power transformer can be damaged if 230 
volts is applied to it when it is connected to operate on 
115 volts. To check to see that the TB801 is connected 
for the correct alternating current (ac) voltage, connect 
the receiver to a 115-volt ac line, turn the receiver on, 
and proceed as follows: 

a. If the pilot lamps light at full brilliance, the 
receiver is connected for 115-volt operation. 



Z IS 

3 



J8II 



TB8CH 



°K) °M 
204969699° 



A. MS-VOLT OPERATION 



B. ZJO-VOIT OPERATION 



TKS820-S5S-M-* 



Figure 6. Connection for 115-volt or 230-volt operation. 



10 




© 





| C»OuHO SET KfCWC «PdTln6 POwtSl 

© 



1 Each receiver is shipped with jumpers connected 
between terminals 1 and 2, 3 and 4, 11 and 12, and 14 
and 15. These four jumpers are required for normal 
operation. 



2 Plug the power cord into the ac power source. 

Caution: Be sure that the power 
source is of the proper frequency 
and voltage. 




3 For connecting 50- to 200-ohm balanced antennas, 
such as a balanced doublet to the BALANCED 
ANTENNA connector, use Radio Frequency Cable RG- 
22 with Connector Plug UG-421/U, or use Radio 
Frequency Cable RG-86/U with Connector Plug 969/U. 




4 For adapting unbalanced coaxial lead in to the 
BALANCED ANTENNA connector, use Adapter 
Connector UG-971 /U with lead in terminated in 
Connector Plug 573/U whenever possible; if these are 
not available, use Adapter Connector UG-970/U with 
lead-in terminated in Connector Plug PL-259. 



c 




4^ AttltNBA 




5 For connecting a whip antenna or a random length 
single-wire antenna to the UNBALANCED ANTENNA 
connector, use Connector Plug UG-573/U. Make the 
antenna lead-in (Radio Frequency Cable RG-8/U or RG- 
11 /U) as short as possible. 



Figure 7 (1). Connecting procedure (part 1 of 4). 



TM5820-358-20-7(1) 



11 




6 Perform step 7, 8, or 9 below, depending on the type 
of listening device used. 



5r(sS tjty ..Oi a 




7 Plug the headset into the PHONES jack. 




8 Connect the headset terminals to PHNS terminal 8 
and terminal 7 (ground). 

9 Connect the loudspeaker terminals to LOCAL AUDIO 
terminals 6 and 7. 




10 For balanced line operation, connect the balanced 
line to LINE AUDIO terminals 10 and 13. If a balancing 
bridge is to be used for long-distance applications, 
perform steps 11 and 12 below. 




1 1 Remove the jumper from terminals 1 1 and 12. 




1 2 Connect the balancing bridge between terminals 
11 and 12. 



Figure 7 (2). Connecting procedure (part 2 of 4). 



TM5820-358-20-7 (2) 



12 



b. If the pilot lamps light at half brilliance, the 
receiver is connected for 230-volt operation. 

c. If the pilot lamps light at full brilliance and the 
receiver is to be used on 230 volts, disconnect the 
re ceiver and remove the power supply subchassis from 
it jpara 181 Connect T801 for 230-volt operation [(fig] 



WARNING: The voltages used in 
this receiver are high enough to 
endanger human life. To prevent 
shock hazard to personnel touching 
outside metal parts of the receiver, 
connect GND terminal 16 on the rear 
panel to the same ground as that of 
the power source. Do not depend on 
the front panel screws or the antenna 
transmission line to ground the 
chassis. 



13 



13 If a transmitter is being used with the receiver for 
break-in operation, connect the control lines from the 
transmitter to BRK IN terminal 9 and GND terminal 16. 




14 For external gain control, remove the jumper from 
RF GAIN terminals 1 and 2, and perform step 15. 



Figure 7(3). Connecting 



15 Connect an external 5,000-ohm potentiometer to RF 
GAIN terminal 1 and terminal 7 (ground). 




16 To use an external diode load, remove the jumper 
from DIODE LOAD terminals 14 and 15, and perform 
step 1 7. 



TM 5820-358-20-7 (3) 

procedure (part 3 of 4). 



14 




18 For external automatic gain control (age), remove the 
jumper from AGC NOR terminals 3 and 4, and perform 
step 19. 



Figure 7 (4). 




20 For frequency-shift converters that require an 
intermediate frequency (if.) output in a teletypewriter 
system, connect the coaxial transmission cable 
terminated in Radio Frequency Plug UG-88 to IF 
OUTPUT jack. 



T5820-358- 20-7 (4) 

procedure (part 4 of 4). 



15 



CHAPTER 3 
MAINTENANCE INSTRUCTIONS 



Section I. GENERAL 



8. Scope of Second Echelon Maintenance 

Second echelon maintenance consists of the following: 

a. Replacement of defective fuses (TM 11-5820- 
358-10). 

b. Preventive maintenance |(para 1l"t . 
Lubrication (para 12). 



c. 
d. 
e. 
f. 

9- 
h. 



Visual inspection (para 13). 
Overall operational test (para 14). 
Troubleshooting (sect II). 
Tube testing [(para 17) . 
Replacement of power supply 



and audio 



frequency (af) subchassis|(para 18|andl19)J 



/'. Replaceme nt of crystals and incandescent 
lamps kpara 20H23T 

9. Tools, Materials, and Test Equipment Required 

The materials, tools, and test equipment required for 
second echelon maintenance are listed below. 

a. Tools. 

Tool Equipment, TE-41. 

b. Materials. 

Cheesecloth, bleached, lint-free. 
Cleaning Compound (Federal stock No. 
7930-395-9542). 

c. Test Equipment. 



Nomenclature 


Common name 


Technical manual 


Test Sets Electron Tube TV-7/U, TV-7A/U, TV-7B/U, 


Tube tester 


TM 11-6625-274-12 


and TV-D/U, or equal 






Multimeter AN/URM-105 


Multimeter 


RM 17-6625-203-12 



10. Special Tools Supplied (TM 11-5820-358-10) 

a. Phillips Screwdriver. The Phillips screwdriver is 
used to remove the screws that fasten the dust covers, 
the front panel, the removable subchassis, and the 
terminal boards. 

b. Bristo (Fluted) Socket Wrench. The No. 8 
fluted socket wrench is used for removing the front 
panel bar knobs and the MEGACYCLE CHANGE and 
KILOCYCLE CHANGE knobs. 



1 1 . Preventive Maintenance 

a. DA Form 11-238. DA Form 11-238 1 (f ig.~8b is a 



preventive maintenance checklist to be used by the 
second echelon repairman. Items not applicable to the 
equipment or to second echelon maintenance are ruled 
out in the figure. Check items 13 through 27 at least 
once per month. References in the ITEM block in the 
figure are to paragraphs that contain additional 
information pertinent to the particular item. Instructions 
for the use of the form appear on the form. 

b. Items. The information in the chart below is 
supplementary to DA Form 11-238. 



16 



Satisfactory, r". 

Adjustment, Repair or Rsplacamat raquirad, X. 
Dsfsct corractad, (T). 



DAILY CONDITION PON MONTH OP 



DAILY 
ITEM 




KM* 
■ION 



COMniTINIII AND OENirtAL CONDITION OF EQUIPMENT. (9 

, -Hr*, cMm, M-MaapA-MM*, (ub**, f«Nb fochnfeaf i 



>- CLEAN DIRT AN O MOIITUNt FMOM < 



. HEADSETS, KEYS, JACKS, PLUai. 



INItlCT CONTNOLI FOP NORMAL OPEPATlON. TAP CONTROLS 
LIQHTLY FOR EVIDENCE OF CUT-OUT FROM LOOSE CONTACT*. 



ALERT FOR UNUSUAL OPERATION OR CONDITION. 



». CLEAN AND TIGHTEN EXT««iORS OF CASES, 



CONDITION EACH WEEK 



SO 
ICH 



ADDITIONAL ITCHI "OB IP AND 10 »C M1LOM IHIPI.CTI0H1 



It. ;IMIPICT SIATtNS Or n-AOILV ACCINIKI 'LUCK- 
OUT ITtMti TU1CI. LAMPS, ruses. CRYSTALS. 
CONNICTOM.#tS**«*Mt PLUS-IN COILI. PARA lib 



CONDITION 



• . INSPEC T C ASES. 



*N«S»*ANO EXPOSED METAL 
SURFACES FOR RUST. CORROSION. 



PARA lib 



/ 



IS. INSPECT RELAYS AND CIRCUIT SNEAKERS FOR LOOSE 
MOUNTINGS. SAD CONTACTS. MIS' ALINEMENT OF CON* 



INSPECT CORDS. CABLE. WIRE. 
SHOCK MOUNTS FOR CUTS, KINKS. 
BREAKS. FRAYING. UNDUE STRAIN. 



IT. INSPECT VARIABLE CAPACITORS FOR DIRT. MIS- ALI NEMEN T 
OF PLATES. LOOSE MOUNT INGS, MOISTURE. 



I*. INSPECT RESISTORS, BUSHINGS .AND INSULATORS FOR CRACKS, 
CHIPPING. S)L 1ST ERlNC , MOISTURE. DISCOLORATION. 



» AND INTERIORS OF CHASSIS 



ANO CABINETS NOT READILY ACCESSIBLE. PARA lib 



/ 



INSPECT ACCESSIBLE ITEMS FOR LOOSE- 
NESS: SWITCHES. KmOBS, JACKS. CONNECTORS, 
RELAYS. TRANSFORMERS, ««Os*^-**H PILOT 
LIGHTS, M ■ nifSI, ETC- 



20. INSPECT TERMINAL BLOCKS FOR LOOSE 
CONNECTIONS, CRACKS ANO ERE AM S. 



II. CLEAN ANO- OR INSPECT . 



NAME PLATES. DIAL AND METER WINOOWS. 



SI, INSPECT TERMINALS OF LARGE FIXED CAPACITORS ANO 
RESISTORS FOR DIRT. CORROSION. LOOSE CONTACTS. 



1-1. INSPECT TRANSFORMERS. CHOKES. POTENTIOMETERS 

• MM Ti""* ' — '"1 OVERHE A TINS ANO OIL LEAKAGE. 



ADDITIONAL ITEMS POP 20 AND 10 ECHELON INSPECTIONS 



CONDITION 



1*. INSPECT i 



BASKETS FOR 



i WORN OR LOOSE PARjTS. 



COPfTWVMD ON PAQK 4 



TMftStO-SM-ZO-S 

Figure 8. DA Form 1 1-238, pages 2 and 3. 
17 



ADDITIONAL ITEMS FOR ZD AND lO ECHELON INSPECTIONS 


CONDITION 


MAINTENANCE CHECK LIST FOR SIGNAL EQUIPMENT 
SOUND EQUIPMENT. RADIO, DIRECTION FINDING 
RADAR, CARRIER, RADIOSONDE AND TELEVISION 

CAR TtO-ftS) 






ST. CHICK FOR NORMAL WIMTIM. 


S 


EQUIPMENT NOMENCLATURE 

RADIO RECEIVER R-340A/URR 






IF DEFICIENCIES NOTKD ARB NOT COHMCTSD DuniNt THE INSPECTION. INOICATK 
ACTION TAKEN FOR CORRECTION. 

c 

c 
k 


CQUIPMCMT SCftlAL. NUMSCH _ 

4271 


INSTRUCTIONS 

This form mmy be need for • period of ooa month by using th« comet date* and 
weeks of the mooth- It is to be used ae a Preventive Maintenance check list 
for SegmJ equipment in actual one, or for e check on equipment prior to issas. 

1. For detailed Preventive Maintenance instructions see: 

a. The Technical Ma nasi fin TM 11 eeriea ) tor the equipment. 
(See OA Peerphler rVumoer 310-4) 

b. The Supply Bulletin (SB It -100 eerreaj for the equipment. 
(Sao DA Pentpoler rVumoer 310-4) 

c. The Depart Me at of the Army Lubrication Oder. 
(Sao DA Pemphlel Wumoer 310*4) 

1. The following action will be taken by cither the Coimnunicatione Officer/ 
Chief for 1st echelon, or the Inspector for hifber echelon: 

a. Enter Equip earn! Nomenclature and Serial 11 amber. 

b, Strike out items that do not apply to the equipment. 



3. Operator/Inspector erill enter in the columns entitled CONDITION, on the 
proper line, a notation) re^arrling the condition, using symbols specified ubumm 
LEGEND. 



4. After operator completes each dally inspection he will initial over the 
appropriate dates —list "Dally Condition for Moots.'', then return fans to 
his S spa n lace. 




DAKvnrll-238 



REPLACES DA FORMS ll-SSS. 1 NOV SSI I l-SSS, 

ti4«4. ii-ses, ii-sea. n-aee, i i-iss. and n*sstt 

WHICH ARB OSSOLETE. 



TM5820-338-20-«0 



Figure 9. DA Form 1 1-238, pages 1 and 4. 



18 



pass the tests, alignment or circuit repair is usually 
required at a higher maintenance le vel. Before turning 
in the receiver, refer t d paragraph 1 fl f(5) and (6). 



Control 


Position 


RF GAIN 


10 


FUNCTION switch 


CAL 


BFO switch 


ON 


BFO PITCH control 


+2 


LINE GAIN control 


10 


LOCAL GAIN control 


6 


BANDWIDTH KC switch 


4 


AUDIO RESPONSE switch 


WIDE 


AGC switch 


MED 


LIMITER control 


OFF 


LINE METER switch 






b. Disconnect the antenna. Tune the KILOCYCLE 
CHANGE control to any 100-kilocycle (kc) point for a 
maximum indication of the CARRIER LEVEL meter. 

c. Starting at 02, turn the MEGACYCLE CHANGE 
control to each band. Adjust the ANT TRIM and 
KILOCYCLE CHANGE controls for maximum indication 
of the CARRIER LEVEL meter for each band. Listen to 
the signal produced by the calibration oscillator. The 
signal should be approximately at the same level for all 
bands. The minimum indication of the LINE LEVEL 
meter should be at the VU mark for all bands. This test 
will indicate which bands are not operating properly. 
Either alignment or circuit repair of these bands is 
usually required to return the bands 



to normal sensitivity. This work will be done at a higher 
maintenance level. 

d. Turn the BFO switch to OFF and listen for a 
hum in the headset or loudspeaker. A slight hum is 
normal, but excessive hum indicates the need for repair 
at a higher maintenance level. 

15. Equipment Performance Checklist 

a. General. The equipment performance checklist 
(e below) will help the repairman to locate faults in the 
receiver. The list gives the items to be checked, the 
conditions under which the items are checked, the 
normal indications of correct operation, and the 
corrective measures to be taken. Follow the items in 
numerical sequence. 

b. Action or Condition. For some items, the 
information given in the Action or condition column 
consists of the various switch and control settings with 
which the items are to be checked. For other items, it 
represents an action that must be taken to check the 
normal indication. 

c. Normal Indications. The normal indications 
listed include the visible and audible signs that the 
repairman should observe when the items are checked. 

d. Corrective Measures. The corrective measures 
listed are those that the second echelon repairman can 
make without turning the equipment in for higher 
echelon repairs. If the recommended corrective 
measures do not remove the fault, higher echelon repair 
is necessary. 



e. Equipment Performance Checklist. 





Step 
No. 


Item 


Action or 
condition 


Normal 
indications 


Corrective 
measures 


p 

R 
E 
P 
A 
R 

A 


1 


Antenna 


Lead-in wire connected. 






2 


Loudspeaker or head- 
set. 


Loudspeaker connected 
to LOCAL AUDIO 
terminals 6 and 7, or 
headset lugged into PHONES jack 






C I- O DC > 


3 


600-ohm line 


Connected to terminals 
10 and 1. If 600-ohm 
line is not available, 
connect headset to 







21 





Step 
No. 


Item 


Action or 
condition 


Normal 
indications 


Corrective 
measures 


p 






terminals for test 
purpose 






. DC HI 


4 


Power cord 


Connected to ac power 
source. 






A 
R 
A 


5 


AUDIO RESPONSE 
switch. 


Set at WIDE. 






T 


R 
Y 


6 


BANDWIDTH 
switch. 


Set at 8 KG 






7 
8 


RF GAIN 

LOCAL GAIN 
control. 


Set at 10. 
Set at 6. 






E 
Q 
U 
1 

P 


9 


FUNCTION switch- 


Turn to AGC 


Dial lamps light 


Check power cord, Check 
dial lamps and AC 3 
AMP fuse. Refer to 
TM 11-5820-358-10. 








Rushing noise or signal 
heard in speaker or 
headset 


Test tubes. Check con- 
nectors between sub- 
chassis. Refer to para- 
graphs 141 16.landTl7l 


M 
E 


10 


MEGACYCLE 
CHANGE 
control 


Set at each band in 
turn. 


Normal signal output 
on each band. 


Rotate control several 
times to clean switch 
contacts. 


N 
T 

P 
E 


11 


KILOCYCLE 
CHANGE 
control 


Tune across any band 


Signals received. CAR- 
RIER LEVEL meter 
indicates strength of 
received signals. 


Refer to paragraphs 14 
andl6] 

Refer to paragraphs 14, 
16andPl7] 


R 
F 


12 


ANT TRIM 


Rotate control 


Obtain peak indication 
on CARRIER LEV- 
EL meter for each 
band. 


Refer to paragraphs 14, 
QjOandjZI 



R 


13 


LOCAL GAIN 
control. 


Rotate control in either 
direction. 


Volume at loudspeaker 
or headset increases 
and decreases. 


Refer to paragraphs 14, 
16andJ7] 


M 
A 
N 


14 


LINE GAIN control 


Rotate control 


Output level to 600-ohm 
line or headset and 
LINE LEVEL meter 
increases and de- 
creases. 


If headset level varies 
and pointer of meter 
is sticking, tap meter 
lightly. 


C 
E 










If local output is satis- 
factory but line out- 
put is weak, check 



22 





Step 
No. 


Item 


Action or 
condition 


Normal 
indications 


Corrective 
measures 












tubes V602 and V604. 
Refer td paraqraph 1 7.| 




15 


RF GAIN control 


Rotate control 


Audio output and CAR- 
RIER LEVEL meter 
indication increase and 
decrease. 


Refer td paraqraph 16J 


E 

Q 
U 


16 


FUNCTION switch 


Turn to MGC 


With no signal input, 
noise level should in- 
crease slightly and 
CARRIER LEVEL 
not indicate. 


Higher echelon repair 
required. 


1 

P 






Turn to AGC, and tune 
through several differ- 
ent signals. 


Output volume nearly 
constant. 


Check tubes V506, V508, 
and V509. 


M 
E 






Turn to CAL, and then 
operate KILOCYCLE 
CHANGE control. 


Deflection on CAR- 
RIER LEVEL meter 
at each 100-kc reading. 


Reset ANT TRIM con- 
trol. 


N 
T 


17 


LIMITER control 


Turn clockwise 


Noise peaks are reduced 
in amplitude. 


Check V507. 


P 


18 


BREAK IN relay 
switch. 


Turn to ON. Short BRK 
IN terminal 9 on rear 
panel to ground mo- 
mentarily. 


Break-in relay functions 
to silence receiver. 


Higher echelon repair 
required. 


E 
R 


19 


LINE METER 

switch. 


Turn to 0. Adjust LINE 
GAIN control for 
LINE LEVEL meter 
indicator at VU mark. 


LINE LEVEL meter 
I n d i c a t i o n at VU 
mark. 


Higher echelon repair 
required. 


F 








Turn to +10 


Pointer indicates -10 


Higher echelon repair 
required. 


R 
M 
A 






Turn to -1 


Pointer goes completely 
to right. 


Higher echelon repair 
required. 






Turn to OFF 


Pointer goes completely 
to left. 


Higher echelon repair 
required. 


N 
C 


20 


BFO control and 
BFO PITCH con- 
trol. 


Turn BFO control to 
ON. Tune in a cw 
Signal and vary the 
BFO PITCH control. 


Tone of signal varies 


Check V505. 




21 


BANDWIDTH 
switch. 


Turn from 16KCto.1 
KC. 


Selectivity becomes 
sharper and noise de- 
creases. Only low-fre- 
quency audio tones are 
heard in the counter- 
clockwise positions. 


Refer td DaraaraDh 1 6J 




22 


AUDIO RESPONSE 
switch. 


Operate through both 
positions. 


Permits amplification of 
nearly full af range in 


Quality of voice signal 
improves. 



23 





Step 
No. 


Item 


Action or 
condition 


Normal 
indications 


Corrective 
measures 


E 
Q 
U 
1 

P. 


23 


OVENS switch 


Turn to ON 


WIDE position, and 
800 cps in SHARP 
position. 

Oscillator ovens become 
warm in a few min- 
utes. 


Higher echelon repair 
required. 


P 
E 
R 
F 


24 


FUNCTION switch 


Turn to STAND BY 


Receiver is silent. Fila- 
ment circuits and os- 
cillator circuits are 
kept on for immediate 
reception. 




S 
T 

P 


25 


FUNCTION switch 


Turn to OFF 


Turns off all receiver 
circuits. 





16. Supplementary Equipment Performance 
Checklist Information 

The following procedure is effective when 
isolating receiver faults to a specific subchassis. 
Perform the procedures given in a through h below. 
Replace any defective tubes; if this does not remedy the 
trouble, higher echelon repair is required. 

a. Presetting Receiver. 

(1) Turn the FUNCTION switch to AGC. 

(2) Turn the BANDWIDTH switch to 16. 

(3) Turn the RF GAIN control to 10. 

(4) Turn the LOCAL GAIN control to 6. 

(5) Tune in a local station, preferably at a low 
rf. If no station can be heard, listen to the 
noise produced by the receiver. 

(6) Turn the LINE METER switch to 0. 

(7) Adjust the LINE GAIN control for a 
midscale LINE LEVEL meter reading. 

b. Series Filaments Test. If neither V505 nor V701 
lights, check V505, V701, and current regulator RT510 
flfig. 2land3l 

c. Power-Supply Subchassis Test. If all tubes light 
but the CARRIER LEVEL meter does not deflect and no 
sound or hum is heard in the headset, check V801 and 
V802 <fig. 31 . 



d. Af Subchassis Test |(fig. 2| and |3)| While 
listening to a station or to noise, ground the DIODE 
LOAD terminal on the rear panel (terminal 14). 

(1) The signal or noise at the local output and 
the LINE LEVEL meter indication should 
be greatly reduced. 

(2) If only the local output is reduced, check 
V602, V604, and the seating of connector 
P120. 

(3) If only the remote output is reduced (LINE 
LEVEL meter pointer moves to the left) 
check V602, V603, and the seating of 
connector P1 19. 

(4) If neither output is affected, check V507 
and V601 . 

e. If. Subchassis Tesf Ufia. 2l andf3TI With the 
controls set as in a above, turn the BANDWIDTH switch 
from 16 to each lower position and listen to the sound 
(or noise). 

(1) The output should decrease at each 
position, until it can hardly be heard at .1 . 

(2) If there is little or no change as the 
BANDWIDTH switch is turned, check 
V501 through V504, and V506 through 
V509. 

f. Rf Subchassis Test |(fig. 2| and Set the 
controls as in a above. Start with the megacycle 
frequency indicator at 00 and turn 



24 



the MEGACYCLE CHANGE control through its range to 
the highest frequency and listen to the noise in the 
headset. 

Across the tuning range, some adjustment 
of the ANT TRIM control is necessary to 
produce maximum noise. 
The noise at each detent position should 
be almost constant. 

There should be a pronounced increase in 
noise as the control is seated in each 
detent. 

If the rf tuner does not pass this test, 
check V201 through V204, V207 and 
V701. 

Note. When V701 is replaced, the 
subchassis must be realigned at 
higher echelon. 

(5) If all the bands except 00 th rough 08 
operate, change crystal Y201 Kpara 20l 
andETfl. 

Each crystal in crystal oven HR401 [fig 



(1) 



(2) 
(3) 



(4) 



(6) 



2 



and [12] operates a megacycle band or a 
combination or 1 -megacycle bands. To 
determine which crystal is defective, 
proceed as follows: 
(a) Turn the MEGACYCLE CHANGE 
control to each band to determine 
which bands are inoperative. 
Record the numbers of the 
defective bands. 

Match the combination of defective 
bands with the combinations listed 
in the chart below. 

Replace the defective crystal Kpara 



(b) 
(c) 



(d) 



Megacycle band affected 


Crystal in use 


00, 17 


Y401 


01, 18 


Y402 


02, 08, 19, 30 


Y403 


03, 20 


Y404 


04, 09, 21 


Y405 


05, 22 


Y406 


06, 10, 23 


Y407 


07, 1 5, 24 


Y408 


11, 25 


Y409 


12, 27 


Y410 


13, 29 


Y411 


14, 81 


Y412 


16 


Y413 


26 


Y414 


28 


Y415 



g. Calibration Oscillator Test. To test the 
calibration oscillator, proceed as follows: 

(1) Turn the FUNCTION switch to CAL. 

(2) Turn the MEGACYCLE CHANGE control 
to band 00. 

(3) Tune the KILOCYCLE CHANGE control 
through its entire range. 

(4) Listen for a beat note at every 100kc point 
as the KILOCYCLE CHANGE control is tuned. 

(5) If the calibrator fails to operate, make the 
following tests in the order indicated: 

Check V205 and V206 ffig" 



(a) 
(b) 
(c) 



13. 



h. 

control 



Replace Y203 |(para jj) . 
If the fault cannot be remedied by 
this procedure, higher echelon 
repair is required. 
Antenna Circuit Test. Rotate the ANT TRIM 
The CARRIER LEVEL meter should peak at 
one particular point. 

(1) Disconnect the antenna and ground the 
ANTENNA UNBALANCED connector. A 
click should be heard and the noise 
should drop sharply. 

Ground both contacts of the ANTENNA 
BALANCED connector. A click should be 
heard and the noise should drop sharply. 
If the receiver does not pass this test, 
check the connectors on the antenna 
relay box. 

17. Tube-Testing Techniques 

a. Inspect all interior cable connectors for proper 
seating before removing the tubes. 

b. Isolate the trouble to a specific subchassis of 



(2) 



(3) 



the receiver Kpara 16 
c. Use Test 



Tube TV-7/U or 



Set Electron 
equivalent, and proceed as follows: 

(1) Remove and test one tube at a time. 

(2) Substitute new tubes for only those tubes 
that are defective. 

(3) Immediately discard tubes that are 
shorted or contain heater-to-cathode 
leakage. 

d. If a tube tester is not available, use the tube- 
substitution method. 

(1) Substitute a new tube for an original one. 
If no change is apparent, in the operation of the 
receiver, replace the new tube with the original. Check 



25 



each original tube until the equip ment 
becomes operative or until all suspected 
tubes have been tested, and the need for 
higher echelon repair is indicated. 

(2) Some circuits such as oscillator circuits 
(V206, V207, V401 , V505, and V701 (fig. 
[2and[3)] may function with one tube and 
not another, even though both tubes are 
new. 

(3) If a replacement tube soon becomes 
defective, higher echelon repair is 
required. 

(4) If tube substitution does not correct the 
trouble, be sure that the original tubes are 
in the original sockets before forwarding 
the defective receiver for higher echelon 
repair. 

(5) If another receiver of the same type is 
available, refer to the instructions in g 
below. 

e. Discard tubes only in the cases given in (1) and 
(2) below. Do not discard them merely because they 
meet or are slightly above the lowest acceptable value 
listed in the tube tester chart. Do not discard tubes 
merely because they have been used for some time. 
Satisfactory operation in the receiver is the final proof of 
tube quality. 

(1) Discard a tube when a tube tester or other 
instrument shows the tube to be defective. 

(2) Discard a tube when the defect, such as a 
broken glass envelope or a broken connecting pin, can 
be plainly seen. 

f. Be careful when withdrawing a miniature tube 
from its socket. Do not rock or turn it; pull it straight up. 
The variable-frequency oscillator tube shield is held in 
place by a special clamp. Be sure that the metal insert 
is in place, and then replace the shield. Straighten the 
pins with the proper pin straightener, if one is available, 
before replacing tubes in the receiver. 

g. Tune a similar receiver, which is in good 
operating condition, to a voice signal that is not subject 
to fading, preferably to a signal on one of the lower 
frequency bands. Turn the FUNCTION switch to AGC 
and the RF GAIN control to 10. Make the substitutions 



from the faulty receiver to the corresponding position in 
the good receiver', one tube at a time; gently tap the 
tube under test; if noise or abnormal change in volume 
is observed, replace the tube. A considerable decrease 
in indication on the CARRIER LEVEL meter or a 
noticeable decrease in volume or quality of the signal 
emitted from the speaker or headset indicates a weak or 
otherwise defective tube; however, observe different 
test results for the following tubes. 

(1) When automatic gain control (age) tubes 
V508 and V509A are weak, a decreased 
indication on the CARRIER LEVEL meter 
with an increase in volume may be noted. 
A weak V509B (age time constant circuit) 
will cause an increase in indication on the 
CARRIER LEVEL meter without any 
change in volume. A weak V509B 
intermediate frequency (if.) cathode 
follower will produce a weak signal at the 
IF OUTPUT connector (J116). After 
testing tube V507 (noise limiter) in the 
usual manner, tune the receiver away 
from the test signal and, if noise is 
received, rotate the LIMITER control 
clockwise; the tubes under test and the 
tubes known to be good should be equally 
effective in reducing noise. After testing 
these tubes, return the LIMITER control to 
OFF, and retune the receiver to the test 
signal. To test V505, turn the BFO switch 
to ON and, while turning the BFO PITCH 
control through its entire range, listen for 
the beat note. 

(2) Test tubes V801 and V802 of the power 
supply subchassis and V701 of the vfo 
subchassis by listening to the audio output 
and observing the indication on the 
CARRIER LEVEL meter. Visually inspect 
V605; if it does not glow properly, it will 
cause abnormal voltage on the +150-volt 
regulated line. When testing tubes V205 
and V206, turn the FUNCTION switch to 
CAL, tune through several 100-kc points, 
and observe the indication 



26 



on the CARRIER LEVEL meter. 
(3) Test the tubes in the af circuits by 
listening to the quality of the output signal 
of the af channels. When testing tubes 
V602A and V603 (local af amplifier), listen 
to the output of the local audio channel. 
When testing tubes V602B (line af 
amplifier) and V604, listen to the output 
signal from the balanced-line circuit and 
observe the indication on the LINE LEVEL 
meter. Tube V601 is common to both the 
local and the line af channels. Generally, 
small changes in LINE LEVEL meter 
indication may be expected because of 
certain differences among tubes. 

18. Power-Supply Subchassis Removal and 
Replacement 

a. General. Removal and replacement of the 
power-supply subchassis does not require the removal 
or replacement of other subchassis or parts in the 
receiver, except for plug P1 1 1 . 

b. Removal. 

(1) Disconnect plug P1 11 |(fig. 3| ). 

(2) Loosen the six green-headed captive 
screws that fasten the subchassis to the 
main frame of the receiver. 

(3) Withdraw the subchassis from the 
receiver. The subchassis is heavy; be 
careful not to drop it. 

c. Replacement. 

(1) Carefully lower the power-supply 
subchassis into the receiver. 

(2) Engage the six green-headed screws that 
fasten the subchassis to the main frame 
of the receiver. Tighten each of the 
screws. 

(3) Reconnect plug P111. 

19. Af Subchassis Removal and Replacement 

a. General. The af subchassis can be removed 
from the main frame without the removal of other 
subchassis or parts, with the exception of the cable 
connectors that connect directly to the af subchassis. 



b. Removal: 

(1) Disconnect plugs P119 and P120 |(fig~3~ . 

(2) Loosen the four green-headed captive 
screws that fasten the af subchassis to the 
main frame. 

(3) Lift the af subchassis from the main 
frame. 

c. Replacement. 

(1) Place the af subchassis on the main 
frame. 

(2) Engage and tighten the four green- 
headed captive screws. 

(3) Reconnect plugs P1 19 and P1 20. 

20. Removal and Replacement of Crystal Oven 
HR202 Du ring Maintenance 
ffio~2l andfTlTl 

Removal and replacement of crystal oven 
HR202 does not require removal of the rf subchassis 
from the main frame. 

a. Removal. 

(1) Remove the retaining springs and the 
clamp that hold the oven in its octal 
socket. 

(2) Pull the oven straight up out of its socket. 

b. Replacement. 

(1) Insert the oven in its socket. Make sure 
that the key on its base lines up with the 
keyway in the octal socket. 

(2) Replace the retaining springs and the 
clamp. 

21 . Disassembly and Assembly of Crystal Oven 
HR202 t o Replace Crystals 

a. Disassembly. 

(1) Loosen but do not remove the screws that 
secure the oven cover to the oven. 

(2) Turn the cover to the left 
(counterclockwise) until it stops, and lift 
the cover straight up from the body no the 
oven. 

(3) Lift the crystal shield out of the oven 
body. 

(4) Unplug crystals Y201 and Y203 and 
remove them. 

b. Reassembly. 

(1) When inserting crystals Y201 and 



27 




WW: 

OMEftVC UOCATUN Of CMTtTMJ 
WITH MCWCCT TO «Y OH MX. 
YKX LU WW BL ri TMWUtH MM 4 

4mo i.iw y»j co ww ecw TMMUW 

MNS I AHOt.ON MM Of CRYSTAL 
aVt>> TMSItO-3Sf-<0-l4 



Figure 1 1 . Location of crystal Y201 and Y202. 

Y203, be sure to plug them in at the 
proper lo cations w ith respect to the key on 
the base (fig. 111 . 

(2) Gently push the crystal shield back into 
place. 

(3) Line up the slots at the base of the cover 
with the screws on the base of the crystal 
oven. 

(4) Push the cover down and turn it to the 
right (clockwise) until it stops. 

(5) Tighten the securing screws on the base. 

22. Removal and Replacement of Crystals Under 
HR401 Crystal Oven Cover 

r"tig~2l andlT2T1 

a. Removal. 

(1) Remove the Phillips screw and the 
lockwasher from the top of the subchassis 
and the two similar screws and 
lockwashers at the rear end of the 
subchassis. 




J4MJ _ . 

CUttTM. OtOtURO* 

TMMM-IM-tO-tl 

Figure 12. Location of crystals Y401 through Y415. 



b. 



Lift the cover straight up from the oven. 
The 15 plug-in crystals, Y401 through 
Y415, ar e now accessible for replacement 
Kpara 16| f(6) ). 

Pull the defective crystal straight up out of 
the crystal socket. 
Replacement. 

(1) Replace the defective crystal. 

Replace the oven cover. Be sure that the 
two plugs at the bottom rear of the oven 
cover line up with their jacks on the 
subchassis. 

Replace the three Phillips screws and the 
lockwashers. 



(2) 
(3) 

(4) 



(2) 



(3) 



23. 



Removal and Replacement of Incandescent 
Lamps (TM 11-5820-358-10) 

a. Removal. 

(1) Remove the four Phillips screws from the 
corners of the frequency indicator window. 

(2) Move the frequency-indicator window a 
few inches away from the front panel. Its 
connecting wires will hold it in position. 

(3) Remove the defective incandescent 
lamps. 

b. Replacement. 

(1) Insert the new incandescent lamps. 

(2) Place the frequency-indicator window in 
position; line up the four screw holes. 

(3) Replace and tighten the four Phillips 
screws. 



Note. Do not loosen the four 
Phillips screws on top of the oven 
cover. 



28 



CHAPTER 4 

SHIPMENT AND LIMITED STORAGE AND DEMOLITION 
TO PREVENT ENEMY USE 



Section I. SHIPMENT AND LIMITED STORAGE 



24. Disassembly 

The following instructions are recommended as 
a guide for preparing the receiver for transportation and 
storage. 

a. Disconnect the antenna lead-in cable. 

b. Remove all connections to the terminal strips on 
the rear panel of the receiver. 

c. Unplug the headphone cord from the PHONES 
jack on the front panel. 

d. Disconnect the power cable from the ac outlet 
and wind the cable around the clips provided for it on 
the rear panel of the receiver. 

25. Repacking for Shipment or Limited Storage 

The exact procedure for repacking depends on 
the material available and the conditions under which 
the receiver is to be shipped or stored. Follow the 
procedures outlined in a through c below whenever 
possible, as well as the inf ormatio n concerning the 
original packaging |(para 3 l and lfiq. jj . 
a. Materials Requirement. 



Material 


Quantity 


Waterproof-barrier material 


22 sq ft 


Fiberboard, corrugated, single-faced 


40 sq ft 


Tape, gummed, paper 


10 ft 


Tape, water-resistant, pressure-sensitive, 


16 ft 




3-inch 


Steel strapping, 5/8-inch by 0.020-inch 


13 ft 


Wooden shipping box, 22 1/4 x 20 1/2 x 14 3/4 


1 



b. 

(1) 



(2) 



Packaging. 

Inclose each technical manual in a close- 
fitting bag made of waterproof-barrier 
material. Seal the seams of the bag with 
water-resistant, pressure-sensitive tape. 
Cushion the receiver on all surfaces with 
pads made of single-faced corrugated 
fiberboard, in order to absorb shocks that 
might be caused )by handling and 
shipping. Secure the cushioning with 
gummed paper tape, 
c. Packing. 

(1) Line the wooden box with waterproof- 
barrier material. Leave enough material 
so that it may be sealed over the receiver 
when it is placed in the box. 
Place the packaged receiver and the 
packaged manuals in the box. 
Seal the waterproof-barrier material with 
the water-resistant, pressure-sensitive 
tape. 

Nail the top on the wooden box. 
On the intertheater shipments only, apply 
two bands of steel strapping. 
Mark the shipping box according to the 
requirements of AR 220-10, section II. 



(2) 
(3) 



(4) 
(5) 

(6) 



Section II. DEMOLITION OF MATERIEL TO PREVENT ENEMY USE 



26. Authority for Demolition 

Demolition of the equipment will 
accomplished only upon the order of the commander. 



The destruction procedures outlined i r p paragraph 27f wil 
be be used to prevent further use of the equipment. 



29 



27. Methods of Destruction 

Use any of the following methods to destroy the 
equipment. The time available will be the major factor 
for the methods used. 

The tactical situation also will determine in what manner 
the destruction order will be carried out. 

a. Smash. Smash the tuning indicators, dials, 
meter, and controls; use sledges, axes, hammers, 
crowbars, or any other heavy tools available to smash 
the interior of the set. 

b. Cut. Cut all cords and cables in a number of 
places; slash the interior wiring and cabling; use axes, 
machetes, and similar tools to cut the cabling, cording, 
and wiring. 



c. Burn. Burn as much of the equipment as is 
flammable; use gasoline, oil, flamethrowers, or similar 
tools. Burn the technical manuals first. Pour gasoline 
on the cut cables and the internal wiring, and ignite it. 
Use a flamethrower to burn the spare parts, or pour 
gasoline on the spare parts and ignite them. 

WARNING: Be extremely careful 
with explosives and incendiary 
devices Use these items only when 
the need is urgent. 

d. Explode. If explosives are necessary, use 
firearms, grenades, or TNT. 

e. Dispose. Bury or scatter the destroyed parts in 
slit trenches or foxholes, or throw then into streams. 



30 



APPENDIX I 



REFERENCES 



Following is a list of references applicable and 
available to the unit repairman of Radio Receiver R- 
390A/URR. 



AR 220-10 



DA Pam 108-1 



DA Pam 310-4 



FM 21-5 
FM 21-6 

FM 21-30 



Preparation for Oversea 
Movement of Units 
(POM). 

Index of Army Motion 
Pictures, Film Strips, 
Slides, and Phono-Re- 
cordings. 

Index of Technical Man- 
uals, Technical Bulle- 
tins, Supply Bulletins, 
Lubrication Orders, 
and Modification Work 
Orders. 

Military Training. 

Techniques of Military 
Instruction. 

Military Symbols. 



SR 320-5 
SR 320-50 
TM 11-666 
TM 11-2629 

TM 11-5820-358-10 

TM 11-6625-203-12 
TM 11-6625-274-12 



Dictionary of United 
States Army Terms. 

Authorized Abbreviations 
and Brevity Codes. 

Antennas and Radio 
Propagation. 

Antenna Kit for Double- 
Doublet Receiving An- 
tenna. 

Operator's Manual, 
Radio Receiver R- 
309A/URR. 

Multimeter AN/URM- 
105. 

Operator's and Organi- 
zational Maintenance 
Manual : Test Sets; 
Electron Tube TV-7/ 
U, TV-7A/U, TV- 
7B/U, and TV-7D/U. 



31 



APPENDIX II 
MAINTENANCE ALLOCATION 



Section I. INTRODUCTION 



1. General 

a. This appendix assigns maintenance functions 
and repair operations to be performed by the lowest 
appropriate maintenance echelon. 

b. Columns in the maintenance allocation chart are 
as follows: 

(1) Part or component. This column shows 
only the nomenclature or standard item 
name. Additional descriptive data are 
included only where clarification is 
necessary to identify the part. 
Components and parts comprising a 
major end item are listed alphabetically. 
Assemblies and subassemblies are in 
alphabetical sequence with their 
components listed alphabetically 
immediately below the assembly listing. 

(2) Maintenance function. This column 
indicates the various maintenance 
functions allocated to the echelon capable 
of performing the operations. 

(a) Service. To clean, to preserve, and 
to replenish fuel and lubricants. 

(b) Adjust. To regulate periodically to 
prevent malfunction. 

(c) Inspect. To verify serviceability and 
to detect incipient electrical or 
mechanical failure by scrutiny. 

(d) Test. To verify serviceability and to 
detect incipient electrical or 
mechanical failure by use of special 
equipment, such as gages, meters, 
etc. 

(e) Replace. To substitute serviceable 
assemblies, subassemblies, and 
parts for unserviceable 
components. 

(f) Repair. To restore to a serviceable 
condition by replacing 
unserviceable parts or by any other 
action 



required, using tools equipment, 
and skills available, to include 
welding, grinding, riveting, 
straightening, adjusting, etc. 
(g) Align. To adjust two or more 
components of an electrical system 
so that their functions are properly 
synchronized. 

(3) 1st, 2nd, 3d, 4th, 5th echelon. The 
symbol X indicates the echelon 
responsible for performing that particular 
maintenance operation, but does not 
necessarily indicate that repair parts will 
be stocked at the level. Echelons higher 
than the echelon marked by X are 
authorized to perform the indicated 
operation. 

(4) Tools required. This column indicates 
codes assigned to each individual tool 
equipment, test equipment, and 
maintenance equipment referenced. The 
grouping of codes in this column of the 
maintenance allocation chart indicates the 
tool, test, and maintenance equipment 
required to perform the maintenance 
function. 

(5) Remarks. Entries in this column will be 
used when necessary to clarify any of the 
data cited in the preceding columns. 

c. Columns in the section allocation of tools for 
maintenance functions are as follows: 

(1) Tools required for maintenance functions. 
This column lists the tool, test, and 
maintenance equipment required *to 
perform the maintenance functions. 

(2) 1st, 2d, 3d, 4th, 5th echelon. A dagger (t) 
symbol indicates the echelons allocated 
the facility. 



32 



(3) Toot code. This column lists the tool code 
assigned. 

(4) Remarks. Entries in this column are used 
for explanatory notes. 

2. Maintenance by Using Organizations 

When this equipment is used by signal service 
organizations organic to theater headquarters or 
communications zones to provide theater 
communications, those maintenance 



functions allocated up to and including fourth echelon 
are authorized to the organization of operating this 
equipment. 

3. Mounting Hardware 

The basic entries of the maintenance allocation 
chart do not include mounting hardware, such as 
screws, nuts, bolts, washers, brackets, clamps, etc. 



33 



Section II. MAINTENANCE ALLOCATION CHART 



(1) 



42X- 



(3) (4) 




Part or component 



Maintenance 
function 



-I si 2 na 
ech. ech. 



5™ 
ech. 



Tools 
required 



Remarks 



RECEIVER, RADIO R-390A/URR 



ADAPTER, CONNECTOR 
AMPLIFIER, RADIO FREQUENCY 

AUDIO ASSEMBLY 

CABLE, RADIO FREQUENCY 

CABLE, POWE ELECTRICAL 

CAP, ELECTRICAL 

CAPACITOR ASSEMBLY 

CAPACITOR, FIXED 

CAPACUTOR, VARIABLE 

CAPACITOR, KIT 

CLAMP, ELECTRICAL 

CLIP, ELECTRICAL 

COLLAR SHAFT 

COIL, RADIO FREQUENCY 

CONNECTOR, PLUG, ELECTRICAL 

CONNECTOR, RECEPTACLE, ELECTRICAL 

CONVERTER, FREQUENCY, ELECTRONIC 

CORE, ADJUSTABLE TUNING 

COUNTER, ROTATING, FICED MOUNTING 

COUPLING, SHAFT, FLEXIBLE 

COVER, ELECTRICAL CONNECTOR 

CRYSTAL UNIT, QUARTZ 

CRYSTAL UNIT, RECTIFYING 

DETENT, SWITCH 

ELECTRON TUBE 

FILTER, BANDPASS 

FILTER, RADIO INTERFERENCE 



service 

adjust 

inspect 

test 

align 

replace 

replace 

repair 

replace 

repair 

replace 

replace 

replace 

replace. 

replace 

replace 

replace 

replace 

replace 

replace 

replace 

replace 

replace 

replace 

repair 

replace 

replace 

replace 

replace 

replace 

replace 

replace 

replace 

replace 

replace 



11,12 
7,11,12 

4,5,6,8,9,10 
1 thru 6,8,9, 
10, 12, 13,14 



R-390A/URR 1 



34 



(1) 

Part or component 



R-390A,/URR (continued) 
FUSE, CARTRIDGE 
FUSEHOLDER 
GEAR, BEVEL 
GEAR, BEVEL AND SPUR 
GEAR, SPUR 

GEAR TRAIN ASSEMBLY, RADIO FREQUENCY 

GEAR ASSEMBLY 

GUIDE, COUPLING 

HOLDER, CRYSTAL UNIT 

INSERT, ELECTRICAL, CONNECTOR 

JACK, TELEPHONE 

JACK TIP 

KNOB 

LAMP, GLOW 
LAMP, INCANDESCENT 
METER, RADIO LEVEL 
OSCILLATOR, RADIO FREQUENCY 

OSCILLATOR, VARIABLE FREQUENCY 

OVEN, CRYSTAL 
OVEN, TUNED CIRCUIT 

PLATE, GEAR, SUB-ASSEMBLY 

POST, BINDING 

REACTOR 

RECTIFIER, METALLIC 
RELAY, ARMATURE 
RESISTOR, FIXED 

RESISTOR, CURRENT REGULATING 



R-390A/URR 



Section II. MAINTENANCE ALLOCATION CHART 



(2) 



(3) (4) 




49^ 



Maintenance 
function 



5™ 
ech. 



Tools 
required 



Remarks 



replace 

replace 

replace 

replace 

replace 

replace 

replace 

replace 

replace 

repair 

replace 

replace 

replace 

replace 

replace 

replace 

replace 

repair 

replace 

repair 

replace 

replace 

repair 

replace 

replace 

replace 

replace 

replace 

replace 

replace 



X 
X 



X 
X 
X 
X 
X 
X 
X 
X 
X 
X 



X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 



35 



Section II. MAINTENANCE ALLOCATION CHART 



(1) 



(2) 



(3) (4) 




49^ 



Part or component 



Maintenance 
function 



5 m 
ech. 



Tools 
required 



Remarks 



R-390A/URR (continued) 
RESISTOR, VARIABLE 
RING, RETAINING 
SCREWDRIVER. CROSS TIP 
SHELL, ELECTRICAL CONNECTOR 
SHIELD, ELECTRON TUBE 
SOCKET, CRYSTAL 
SOCKET, ELECTRON TUBE 
SPRING, HELICAL EXTENSION 
SHELL, ELECTRICAL CONNECTOR 
STOP, DIAL 

SUPPRESSOR, PARASITIC 
SWITCH, ROTARY 
SWITCH ASSEMBLY 
SWITCH, THERMOSTAT 
SWITCH, SECTION, ROTARY 
TERMINAL BOARD 
TRANSFORMER 
WASHER, STOP 

WRENCH, SOCKET HEADSCREW 



replace 
replace 
replace 
replace 
replace 
replace 
replace 
replace 
replace 
replace 
replace 
replace 
replace 
replace 
replace 
replace 
replace 
replace 
replace 



OE item. Cam be use by 2 nd echelon personnel 



R-390A/URR 



36 



Section III. ALLOCATION OF TOOLS FOR MAINTENANCE FUNCTIONS 



(1) 


(2) 


(3) 


(4) 


(5) 


(6) 


(7) 


(8) 




1 st 




3 rd 




5 ,h 


Tool 




Tools Required For Maintenance Functions 


ech. 


ech. 


ech. 


ech. 


ech. 


Code 


Remarks 


R-390A/URR (continued) 
















ANALYZER, SPECTRUM TS-723/U 








t 


t 


1 




AUDIO OSCILLATOR TS-382/U 








t 


t 


2 




ELECTRON TUBE TESTER TV-2/U 








t 


t 


3 




ELECTRON TUBE TESTER, TV-7/U 




t 


t 


t 


t 


4 




FREQUENCY METER SET, 1-129 






t 


t 


t 


5 




LOUDSPEAKER LS-3 






t 


t 


t 


6 




MULTIMETER, TS-297/U 




t 








7 


Replaced by AN/URM-105 


MULTIMETER, TS-3512 






t 


t 


t 


8 


Replaced by AN/URM-105 


MULTIMETER, TS-505 






t 


t 


t 


9 




SIGNAL GENERATOR, AN/URM-2 






t 


t 


t 


10 




TOOL EQUIPMENT, TE-41 




t 








11 




TOOL EQUIPMENT, TE-113 






t 


t 


t 


12 




TOOL EQUIPMENT TE-1 14 








t 


t 


13 




VOLTMETER, ME-6A/U 








t 


t 


14 


Replaced by ME-30A/U 



R-390A/URR 



37 



BY ORDER OF THE SECRETARIES OF THE ARMY AND THE AIR FORCE: 



OFFICIAL: 

R. V. LEE, 
Major General, United States Army, 
The Adjutant General. 



OFFICIAL: 

J. LTARR, 
Colonel, United States Air Force, 
Director of Administrative Services. 



G. H. DECKER 
General, United States Army, 
Chief of Staff. 



THOMAS D. WHITE, 
Chief of Staff, United States Air Force. 



Distribution 
Active Army: 

To be distributed in accordance with DA Form 12-7 requirements for TM 11 Series (UNCL) Plus the following 
Formula: 



USASA(2) 11-82 

CNGB(1) 11-57 

Tech 8tf , DA (1 ) except 1 1 -85 

CSigO(18) 1186 

DASA(5) 11-98 

USARADCOM(2) 11-117 

US ARADCOM Rgn (2) 1 1 -1 55 

MDW(1) 11-500 (AA-AE) (4) 

Seventh US Army (2) 11-557 

EUSA(2) 11-587 

USASCS(69) 11-592 

Units org under fol TOE: (2 copies each 1 1 -597 

except as indie) 82-51 

11-7 82-56 

11-16 32-57 



NG: State AG (3); Units-Same as Active Army except allowance is one copy to each unit. 
USAR: None, 

For explanation of abbreviations used, see AR 320-50. 



*U.S. GOVERNMENT PRINTING OFFICE: 1990-261-872/21015 



38 




RECOMMENDED CHANGES TO EQUIPMENT TECHNICAL PUBLICATIONS 



3(@ WITH PUBLICATION 



THEN. . JOT DOWN THE 
DOPE ABOUT IT ON THIS FORM. 
CAREFULLY TEAR IT OUT, FOLD IT 
AND DROP IT IN THE MAIL. 



FROM: (PRINT YOUR UNIT'S COMPLETE ADDRESS) 



DATE SENT 



PUBLICATION NUMBER 



PUBLICATION DATE 



PUBLICATION TITLE 



BE EXACT PIN-POINT WHERE IT IS 



PAGE 
NO. 



PARA- 
GRAPH 



FIGURE 
NO. 



TABLE 

NO. 



IN THIS SPACE, TELL WHAT IS WRONG 
AND WHAT SHOULD BE DONE ABOUT IT. 



PRINTED NAME, GRADE OR TITLE AND TELEPHONE NUMBER 



SIGN HERE 



r\A FORM OftOQ 1 PREVIOUS EDITIONS P.S.-IF YOUR OUTFIT WANTS TO KNOW ABOUT YOUR 

UA 1 JUL 79 L\jLQ-L ARE OBSOLETE. RECOMMENDATION MAKE A CARBON COPY OF THIS 

AND GIVE IT TO YOUR HEADQUARTERS. 



The Metric System and Equivalents 



Liquid M—m 



1 centimeter > 10 millimeters = .39 inch 
1 decimeter = 10 centimeters = 3.94 inches 
1 meter = 10 decimeters = 39.37 inches 
1 dekameter = 10 meters = 32.8 feet 
1 hectometer = 10 dekameters = 328.08 feet 
1 kilometer = 10 hectometers = 3,280.8 feet 

WtigBU 

1 centigram = 10 milligrams = .15 grain 
1 decigram = 10 centigrams = 1.54 grains 
1 gram = 10 decigram = .035 ounce 
1 dekagram = 10 grams = .35 ounce 
1 hectogram = 10 dekagrams = 3.52 ounces 
1 kilogram = 10 hectograms * 2.2 pounds 
1 quintal = 100 kilograms = 220.46 pounds 
1 metric ton = 10 quintals = 1.1 short tons 



1 centiliter « 10 milliters « .34 fl. ounce 
1 deciliter = 10 centiliters = 3.38 fl. ounces 
1 liter = 10 deciliters = 33.81 fl. ounces 
1 dekaliter » 10 liters = 2.64 gallons 
1 hectoliter » 10 dekaliters = 26.42 gallons 
lkiloliter = 10 hectoliters = 264.18 gallons 

8qumnM—tur* 

1 sq. centimeter * 100 sq. millimeters = .155 sq. inch 
1 sq. decimeter « 100 sq. centimeters = 15 K ■ 



* — — — — 5 sq. inches 

1 sq. meter (centare) = 100 sq. decimeters = 10.76 sq. feet 
1 sq. dekameter (are) = 100 sq. meters = 1,076.4 sq. feet 
1 sq. hectometer (hectare) = 100 sq. dekameters = 2.47 aci 
1 sq. kilometer = 100 sq. hectometers = .386 sq. mile 



Cubic Mmmsun 

1 cu. centimeter = 1000 cu. millimeters = .06 cu. inch 
1 cu. decimeter = 1000 cu. centimeters = 61.02 cu. inches 
1 cu. meter = 1000 cu. decimeters = 35.31 cu. feet 



Approximate Conversion Factors 



To change 


To 


Multiply b j 


Toeaaago 


To 


Multiply by 


inches 


centimeters 


2.540 


ounce-inches 


newton-meters 


.007062 


feet 


meters 


.305 


centimeters 


inches 


.394 


yards 


meters 


.914 


meters 


feet 


3.280 


miles 


kilometers 


1.609 


meters 


yards 


1.094 


square inches 


square centimeters 


6.451 


kilometers 


miles 


.621 


square feet 


square meters 


.093 


square centimeters 


square inches 


.155 


square yards 


square meters 


.836 


square meters 


square feet 


10.764 


square miles 


square kilometers 


2.590 


square meters 


square yards 


1.196 


acres 


square hectometers 


.405 


square kilometers 


square miles 


.386 


cubic feet . 


cubic meters 


.028 


square hectometers 


acres 


2.471 


cubic yards 


cubic meters 


.765 


cubic meters 


cubic feet 


35.315 


fluid ounces 


milliliters 


29,573 


cubic meters 


cubic yards 


1.308 


pints 


liters 


.473 


milliliters 


fluid ounces 


.034 


quarts 


liters 


.946 


liters 


pints 


2.113 


gallons 


liters 


3.785 


liters 


quarts 


1.057 


ounces 


grams 


28.349 


liters 


gallons 


.264 


pounds 


kilograms 


.454 


grams 


ounces 


.035 


short tons 


metric tons 


.907 


kilograms 


pounds 


2.205 


pound-feet 


newton-meters 


1.356 


metric tons 


short tons 


1.102 


pound-inches 


newton-meters 


.11296 









Temperature (Exact) 



°F Fahrenheit 
temperature 



5/9 (after 
subtracting 32) 



Celsius °C 
temperature 



PIN: 006391-000